# Challenge Events | List Of All Upcoming Challenge Events In Oakland - **Subtitle**: Explore all upcoming challenge events in Oakland, find information & tickets for upcoming challenge events happening in Oakland. - **Category**: ## About Explore all upcoming challenge events in Oakland, find information & tickets for upcoming challenge events happening in Oakland. ## Events in Oakland - **Event Name**: Billy Strings - **Description**: πŸ“ Venue: Oakland Arena 🏠 Address: 7000 Coliseum Way, Oakland, CA 94621 πŸŒ† City: Oakland πŸ“ Location: 37.7503, -122.203🌟 Journey into wonder at Billy Strings, where extraordinary experiences await around every corner! πŸ›οΈ Set against the bac - **Date**: Fri Oct 02 2026 – Sat Oct 03 2026 (-08:00) - **Event URL**: https://allevents.in/oakland/billy-strings/3200030185369432 - **Venue**: Oakland Arena - **Banner**: https://dyn-image.allevents.in/generate-image?v=4&title=Billy+Strings&date=Fri+Oct+02+2026&bg=3 - **Categories**: trips-adventures, Contests - **Event Name**: Billy Strings at Oakland Arena - **Date**: Fri Oct 02 2026 at 07:30 pm – Sat Oct 03 2026 at 09:30 pm (-08:00) - **Event URL**: https://allevents.in/oakland/billy-strings-at-oakland-arena/2400029901216429 - **Venue**: Oakland Arena - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9jZG4tYXouYWxsZXZlbnRzLmluL2V2ZW50czYvYmFubmVycy83YTgyYWU4MC1hNGZhLTExZjEtODM0NS04MTYwZjEzMDZjNjYtcmltZy13MTIwMC1oMTIwMC1kYzA4MDgwOC1nbWlyLmpwZz92PTE3ODgxNTMxMjU.avif - **Categories**: trips-adventures, contests - **Event Name**: Joey Alexander, solo - **Description**: LIVE at Piedmont Piano Company JAZZ PIANO MASTERS SERIES Joey Alexander, solo TWO SHOWS 5:30pm and 8pm GRAMMY-nominated pianist and composer Joey Alexander makes his debut at the piano store to share his newest album Celestial Keeper (July 2026, Mack A - **Interested Audience**: - Count: 18 - **Date**: Tue Sep 29 2026 at 05:30 pm (-07:00) - **Event URL**: https://allevents.in/oakland/joey-alexander-solo/200030347309111 - **Venue**: 1728 San Pablo Ave, Oakland, CA, United States, California 94612 - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9jZG4tYXouYWxsZXZlbnRzLmluL2V2ZW50czkvYmFubmVycy83MzY4MzgwYWMyZjBhYmQwNzllMzA3NTRjNjEwZGMyNDNjZmI4NzRiZWRlM2YyNzJkM2Q0MzEwMDgyYjk0OTFiLXJpbWctdzEyMDAtaDYyOC1kYzM4MjgyOC1nbWlyP3Y9MTc4ODA0NTA5Nw.avif - **Categories**: music, entertainment, art, contests - **Event Name**: The Fright Crawl | Oakland's #1 Halloween Bar Crawl 2026 | Sat, Oct 31 - **Description**: Oakland's biggest Halloween bar crawl. The city's best bars & clubs, live DJs, no cover. Sat, Oct 31 β€” 800 spots.About this Eventhttps://vimeo.com/1219059959πŸŽƒπŸ•ΈοΈ - **Date**: Sat Oct 31 2026 at 07:30 pm – Sun Nov 01 2026 at 02:00 am (-07:00) - **Event URL**: https://allevents.in/oakland/the-fright-crawl-oaklands-1-halloween-bar-crawl-2026-sat-oct-31/100001998589385653 - **Venue**: Little Bird Bar - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9jZG4tYXouYWxsZXZlbnRzLmluL2V2ZW50czEvYmFubmVycy9iMzFiZGY1MDViN2FhODdiZGJjOGE5NmNhYWZiMzVlYWNhNzI1MjczMmI1M2VmNmViM2RhYWQ3MTY3MWQ4ODEyLXJpbWctdzEyMDAtaDYwMC1kYzA4MDgxOC1nbWlyLmpwZz92PTE3ODc4MTMxODU.avif - **Price**: USD 8 to 66 - **Categories**: fitness, Parties, Entertainment, Contests - **Event Name**: Shpongle - **Description**: πŸ“ Venue: Fox Theater - Oakland 🏠 Address: 1807 Telegraph Avenue, Oakland, CA 94612 πŸŒ† City: Oakland πŸ“ Location: 37.808, -122.27✨ Embark on an extraordinary journey at Shpongle, where every moment promises to be unforgettable! 🌟 Imagine of - **Date**: Fri Oct 30 2026 at 08:00 pm – Sat Oct 31 2026 at 10:00 pm (-08:00) - **Event URL**: https://allevents.in/oakland/shpongle/3200029998251046 - **Venue**: Fox Theater - Oakland - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9jZG4tYXouYWxsZXZlbnRzLmluL2V2ZW50czMvYmFubmVycy9jMzVmNmIyMC04NTdlLTExZjEtYWJkYS1kZmVhMTBiZTk5NWUtcmltZy13MTIwMC1oMTE5MC1kY2YxZjFmMC1nbWlyLmpwZz92PTE3ODQ2OTE0OTE.avif - **Categories**: Art, Theatre, trips-adventures, Contests - **Event Name**: Lexington SC at Oakland Roots SC - Presented by AC Transit - **Description**: Sheila E + Elevate Halftime Performance and Conoce Tus RaΓ­ces presented by AC Transit. Postgame Drone Show! Plus The Office Hours pregame in H-Lot. πŸ“ Venue: Oakland Coliseum 🏠 Address: 7000 Coliseum Way, Oakland, CA 94621 πŸŒ† City: Oakland πŸ“ Location: 37.75 - **Date**: Sat Sep 12 2026 at 07:00 pm – Sat Sep 12 2026 at 09:00 pm (-08:00) - **Event URL**: https://allevents.in/oakland/lexington-sc-at-oakland-roots-sc-presented-by-ac-transit/3200029987546359 - **Venue**: Oakland Coliseum - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9jZG4tYXouYWxsZXZlbnRzLmluL2V2ZW50czQvYmFubmVycy9hYjViMjllMC1hNzQwLTExZjEtYjk4Zi1jYmViYTM1ODViM2EtcmltZy13MTIwMC1oMTIwMC1kYzE4MTgxOC1nbWlyLmpwZz92PTE3ODg0MDMxNjI.avif - **Categories**: trips-adventures, Contests - **Event Name**: Phoenix Rising FC at Oakland Roots SC - Presented by Dymatize - **Description**: πŸ“ Venue: Oakland Coliseum 🏠 Address: 7000 Coliseum Way, Oakland, CA 94621 πŸŒ† City: Oakland πŸ“ Location: 37.7514, -122.201✨ Embark on an extraordinary journey at Phoenix Rising FC at Oakland Roots SC - Presented by Dymatize, where every mom - **Date**: Sat Sep 26 2026 at 07:00 pm – Sat Sep 26 2026 at 09:00 pm (-08:00) - **Event URL**: https://allevents.in/oakland/phoenix-rising-fc-at-oakland-roots-sc-presented-by-dymatize/3200030306925543 - **Venue**: Oakland Coliseum - **Banner**: https://dyn-image.allevents.in/generate-image?v=4&title=Phoenix+Rising+FC+at+Oakland+Roots+SC+-+Presented+by+Dymatize&date=Sat+Sep+26+2026+at+07%3A00+pm&bg=4 - **Categories**: trips-adventures, Contests - **Event Name**: Gracie Abrams at Oakland Arena - **Date**: Sun Dec 06 2026 at 08:00 pm – Mon Dec 07 2026 at 10:00 pm (-08:00) - **Event URL**: https://allevents.in/oakland/gracie-abrams-at-oakland-arena/2400030176953510 - **Venue**: Oakland Arena - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9jZG4tYXouYWxsZXZlbnRzLmluL2V2ZW50czQvYmFubmVycy8wYzUxYTA4MC05YTg1LTExZjEtOWJjNi04YjRmNTZkYjZjNDMtcmltZy13MTAwMC1oMTAwMC1kY2M4ODhiOC1nbWlyLnBuZz92PTE3ODcwMDMyMDM.avif - **Categories**: calendar - **Event Name**: The New Shape of Work - Oakland, CA - **Description**: When we hit an organizational challenge, we often focus on leadership, communication, or culture.About this EventWhat if the root cause is structural? - **Date**: Tue Sep 22 2026 at 02:00 pm – Tue Sep 22 2026 at 06:00 pm (-07:00) - **Event URL**: https://allevents.in/oakland/the-new-shape-of-work-oakland-ca/100001996183810513 - **Venue**: Oakland Museum of California - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9jZG4tYXouYWxsZXZlbnRzLmluL2V2ZW50czEvYmFubmVycy8yNGU4N2JlNjgzZDI3YzllN2JjM2Y3ZjcwNDdhMjljYmEwODM5YTU0ZGFiZDM2Yzg2Yjg2YzIzYTUzODM2YTViLXJpbWctdzEyMDAtaDQ2Ni1kYzA4Mzg3OC1nbWlyLmpwZz92PTE3ODU2NDgzMTk.avif - **Price**: USD 499 - **Categories**: fitness, Nonprofit, Art, Contests, Entertainment, Workshops, fine-arts, performances - **Event Name**: Belonging Resident Company dance/theater performance/workshop - **Description**: an interactive dance/theater performance event to share work-in-progress material from our "We Keep Us" show premiering in November.About this EventThis event is part of the Fall of Freedom series happening all over the c - **Date**: Sat Oct 03 2026 at 07:30 pm – Sat Oct 03 2026 at 09:00 pm (-07:00) - **Event URL**: https://allevents.in/oakland/belonging-resident-company-dance-theater-performance-workshop/100001999123897392 - **Venue**: Destiny Arts Center - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9jZG4tYXouYWxsZXZlbnRzLmluL2V2ZW50czEwL2Jhbm5lcnMvOTljOGE4YjJkYzllMzc2MjkxYjA1ODFjMWZkMmJkNmZlNzRjZjhlZGM5ZmJhMTU5MWE2YzViOGZjNWRiNDc1NC1yaW1nLXcxMjAwLWg5MDAtZGNmOGY4ZjgtZ21pci5qcGc_dj0xNzg4MjI4MTg2.avif - **Price**: Free - **Categories**: workshops, art, music, entertainment, contests, dance, theatre - **Event Name**: Herlin Riley - **Description**: "The Groove Master", Herlin Riley is widely considered one of the best drummers in any genre of music performing today. The longtime drummer for the legendary Ahmad Jamal and the Jazz at Lincoln Center Orchestra now leads two groups, his quintet and the - **Interested Audience**: - Count: 13 - **Date**: Wed Nov 11 2026 at 07:30 pm – Wed Nov 11 2026 at 08:45 pm (-08:00) - **Event URL**: https://allevents.in/oakland/herlin-riley/200030563037427 - **Venue**: Yoshi's Oakland -Jack London square - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9jZG4tYXouYWxsZXZlbnRzLmluL2V2ZW50czEvYmFubmVycy9jMDlhM2JiNjI3NjIxMWQ1MDY2ZWEzNTRhYjgxMmQ5OTNiYjJlYjk0MGEzZDRkNmI0ZDk3NDNhZDM0YmRkNTQ3LXJpbWctdzc5OS1oNjAwLWRjMjgwODI4LWdtaXI_dj0xNzg3NTczMDQ4.avif - **Categories**: music, entertainment, performances, festivals, live-music, art, contests - **Event Name**: Workplace Values & Excellence 1 Day Workshop in Oakland, CA - **Description**: Master workplace conduct, business etiquette, and professional behaviour to build trust, strengthen relationships, and succeed at work.About this EventDurationΒ  - **Date**: Thu Sep 03 2026 at 09:00 am (-08:00) - **Event URL**: https://allevents.in/oakland/workplace-values-and-excellence-1-day-workshop-in-oakland-ca/100001996141076695 - **Venue**: For venue information, Please contact us: info@skelora.com - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9jZG4tYXouYWxsZXZlbnRzLmluL2V2ZW50czMvYmFubmVycy8wZGQ0ZmVmZjZiOWFkZTYxMGU4YWNiNDNhNTFjZmNlNjhmNTZjZmQ4ODBmZjEzNDRkM2VjMmVkMDk0OTExNTA5LXJpbWctdzEyMDAtaDY3NS1kY2Y4ZjhmOC1nbWlyLmpwZz92PTE3ODU2NDgzMDc.avif - **Price**: USD 621 to 727 - **Categories**: workshops, meetups, performances, entertainment, contests - **Event Name**: Future-Ready Innovation Program 1 Day Workshop in Oakland, CA - **Description**: Develop innovative thinking, turn creative ideas into practical solutions, and drive business growth through Skelora Edu Tech.About this EventDurationΒ 1 Day ( - **Date**: Tue Sep 08 2026 (-08:00) - **Event URL**: https://allevents.in/oakland/future-ready-innovation-program-1-day-workshop-in-oakland-ca/100001995463371661 - **Venue**: For venue information, Please contact us: info@skelora.com - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9jZG4tYXouYWxsZXZlbnRzLmluL2V2ZW50czkvYmFubmVycy8wM2UwMWRmOTczNjNmZTdlNjRmMzZkMzJlZDRjMWY1M2VkMmUyZTk5YjgwNDljNTI2MmJkMzY0NDYwNzViOWZjLXJpbWctdzEyMDAtaDY3OS1kY2YyZjRmOC1nbWlyLmpwZz92PTE3ODUxNjYyMzM.avif - **Price**: USD 623 to 724 - **Categories**: fitness, Workshops, Contests, Business, Nonprofit - **Event Name**: Workplace Relationship Excellence 1 Day Workshop in Oakland, CA - **Description**: Master strategic networking, develop trusted business connections, and accelerate career growth with Skelora Edu Tech.About this EventDurationΒ 1 Day (10 Execu - **Date**: Thu Sep 10 2026 (-08:00) - **Event URL**: https://allevents.in/oakland/workplace-relationship-excellence-1-day-workshop-in-oakland-ca/100001995327476194 - **Venue**: For venue information, Please contact us: info@skelora.com - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9pbWcuZXZidWMuY29tL2h0dHBzJTNBJTJGJTJGY2RuLmV2YnVjLmNvbSUyRmltYWdlcyUyRjExODkxOTkxMDElMkYyOTc1NTgzMjk2MDIxJTJGMSUyRm9yaWdpbmFsLjIwMjYwNzIwLTA5MTYzOD9hdXRvPWZvcm1hdCUyQ2NvbXByZXNzJnE9NzUmc2hhcnA9MTAmcz0yODU3YTRiMWI1NzU0MTM2ODIxODY1NDI4Y2FkN2M1Mg.avif - **Price**: USD 623 to 727 - **Categories**: fitness, Workshops, Contests - **Event Name**: Billy Strings Oakland Tickets - **Description**: Billy Strings at Oakland Arena - **Date**: Fri Oct 02 2026 at 07:30 pm – Sat Oct 03 2026 at 09:30 pm (-08:00) - **Event URL**: https://allevents.in/oakland/billy-strings-oakland-tickets/100030032798613 - **Venue**: Oakland Arena - **Banner**: https://cdn-ip.allevents.in/s/rs:fill:500:250/g:sm/sh:100/aHR0cHM6Ly9jZG4tYXouYWxsZXZlbnRzLmluL2V2ZW50czIvYmFubmVycy8yNDg1Nzg0MC1hMjdiLTExZjEtOGIwOS00Yjk5ZjhmZTQ4NzItcmltZy13MTE0MC1oNzk4LWRjMTgwOGY4LWdtaXIuanBnP3Y9MTc4Nzg3ODUyMA.avif - **Price**: EUR 69 - **Categories**: trips-adventures, contests ## Trending Events in Oakland - **Event Name**: Jack Harlow at Fox Theater Oakland - **Venue**: Fox Theater Oakland - **Event Name**: BIGBANG in Oakland - **Description**: 🎀 Experience BIGBANG Live at Oakland-Alameda County Coliseum on Saturday, September 5, 2026! 🎀 The countdown has begun! BIGBANG is taking over Oakland-Alameda County Coliseum on Saturday, September 5, 2026 - **Venue**: Oakland-Alameda County Coliseum - **Banner**: https://cdn-az.allevents.in/events3/banners/404a2580-7d9b-11f1-8de7-a55c04e17f2e-rimg-w1200-h675-dcc8c8c8-gmir.webp?v=1783824118 - **Event Name**: Shreya Ghoshal at Oakland Arena - **Venue**: Oakland Arena - **Banner**: https://cdn-az.allevents.in/events9/banners/e1cbad50-a5ed-11f1-8990-5d04d231a2dd-rimg-w1200-h900-dc0858d8-gmir.jpg?v=1788257659 - **Event Name**: Sheena Easton at Yoshis Jazz Club - Oakland - **Venue**: Yoshis Jazz Club - Oakland - **Event Name**: The Bald and the Beautiful LIVE: Very Bald, Very Beautiful - **Description**: Nearby AttractionsThe Bald and the Beautiful has 15 upcoming events.Trixie & Katya has 3 upcoming events.Trixie Mattel has 1 upcoming events.Katya Zamolodchikova has 1 upcoming events.Access - **Venue**: Paramount Theatre Oakland - **Banner**: https://cdn-az.allevents.in/events6/banners/88adca311b543e5af2111c4860d52025f67f2ebe38aa1585d67e050b93eb3a53-rimg-w1024-h576-dc0194bd-gmir.jpg?v=1773861429 - **Event Name**: The Oakland Margarita Festival - **Description**: Margarita Tasting Contest, Live DJ, Food Vendors, Beer Garden, and a Trip Giveaway. Who has the best margarita in Oakland? You decide!About this EventGet ready to sip, savor, and spice things up at the Oak - **Venue**: Drake's Dealership - **Banner**: https://cdn-az.allevents.in/events10/banners/e75eb09e907787b82c0e98cfcfd9bc83258a5c1d5b813721f2b6ac88bdfd3e49-rimg-w1200-h600-dcf1f1f0-gmir.jpg?v=1772102115 - **Event Name**: BIGBANG Oakland Tickets - **Description**: BIGBANG at Oakland Coliseum - **Venue**: Oakland Coliseum - **Banner**: https://cdn-az.allevents.in/events10/banners/2d1e17e0-9cfa-11f1-80bb-ebfa6612c095-rimg-w848-h1200-dc080808-gmir.jpg?v=1787273373 - **Event Name**: Jack Harlow Tickets - **Description**: Turn up the vibes with Jack Harlow bringing smooth flows, charisma, and chart-topping hits πŸ”₯ From catchy hooks to confident bars, expect a high-energy performance packed with style and swagger Get ready for a night of nonstop hip-hop energy, crowd hype, a - **Venue**: Fox Theater - Oakland - **Banner**: https://cdn-az.allevents.in/events7/banners/ecfd5425a8c74371c4039822076d93500f70e99a8bbca6e55878306f8aa8c82d-rimg-w1024-h731-dcf8f8f8-gmir?v=1788434598 - **Event Name**: BAYAREA FEST - **Description**: πŸ”₯ BAY AREA FEST 2026 β€” OAKLAND, CA πŸ”₯ The Bay Area is coming together for one of the biggest Hip-Hop events of the year at Oakland Arena! LIVE PERFORMANCES 🎀 Moneybagg Yo 🎀 DaBaby 🎀 G Herbo FEATURING THE BAY’S OWN πŸŒ‰ Kamaiyah πŸŒ‰ DaBoii πŸŒ‰ 1Umbrella πŸŒ‰ B- - **Venue**: Oakland Arena - **Banner**: https://cdn-az.allevents.in/events10/banners/f2a99626153a8235ec08746c5c37c501b0b9933a1e49355ad639d28e5d7abfeb-rimg-w1080-h1350-dc083848-gmir?v=1788167565 ## FAQs - **Q**: What are the top events in Oakland? - **A:** Billy Strings (Fri Oct 02 2026 at Oakland Arena), Billy Strings at Oakland Arena (Fri Oct 02 2026 at 07:30 pm at Oakland Arena), Joey Alexander, solo (Tue Sep 29 2026 at 05:30 pm at 1728 San Pablo Ave, Oakland, CA, United States, California 94612), The Fright Crawl | Oakland's #1 Halloween Bar Crawl 2026 | Sat, Oct 31 (Sat Oct 31 2026 at 07:30 pm at Little Bird Bar), Shpongle (Fri Oct 30 2026 at 08:00 pm at Fox Theater - Oakland). - **Q**: What are the top free events in Oakland? - **A:** Belonging Resident Company dance/theater performance/workshop (Sat Oct 03 2026 at 07:30 pm at Destiny Arts Center). - **Q**: What events are happening in Oakland today September 03, 2026? - **A:** Workplace Values & Excellence 1 Day Workshop in Oakland, CA (Thu Sep 03 2026 at 09:00 am at For venue information, Please contact us: info@skelora.com). - **Q**: What events are happening in Oakland in September 2026? - **A:** Joey Alexander, solo (Tue Sep 29 2026 at 05:30 pm at 1728 San Pablo Ave, Oakland, CA, United States, California 94612), Lexington SC at Oakland Roots SC - Presented by AC Transit (Sat Sep 12 2026 at 07:00 pm at Oakland Coliseum), Phoenix Rising FC at Oakland Roots SC - Presented by Dymatize (Sat Sep 26 2026 at 07:00 pm at Oakland Coliseum), The New Shape of Work - Oakland, CA (Tue Sep 22 2026 at 02:00 pm at Oakland Museum of California), Workplace Values & Excellence 1 Day Workshop in Oakland, CA (Thu Sep 03 2026 at 09:00 am at For venue information, Please contact us: info@skelora.com). - **Q**: How can I find events in Oakland? - **A:** You can discover upcoming events in Oakland on AllEvents.in. Browse by date, venue, or price to find events that match your interests. - **Q**: How do I buy tickets for events in Oakland? - **A:** You can buy tickets directly through AllEvents.in. Many events offer online booking with options for free, paid, and early-bird tickets. - **Q**: What are the popular venues for events in Oakland? - **A:** Some popular venues hosting events in Oakland include Oakland Arena, 1728 San Pablo Ave, Oakland, CA, United States, California 94612, Little Bird Bar. - **Q**: What is the price range for events in Oakland? - **A:** Prices for events in Oakland range from USD 8 to USD 727. Many events also offer free entry. - **Q**: Who are the top organizers for events in Oakland? - **A:** Popular organizers hosting events in Oakland include Seat Geek, Vivid Events, Piedmont Piano Company. - **Q**: Are there any online events available? - **A:** Yes, many events are available online. You can filter for virtual events on AllEvents.in to attend from anywhere. - **Q**: How can I get notified about new events in Oakland? - **A:** Follow the category on AllEvents.in to get notified when new events are listed in Oakland. ## challenge Events from nearby cities - [challenge Events in Berkeley](https://allevents.in/berkeley/challenge) - [challenge Events in Albany](https://allevents.in/albany-ca/challenge) - [challenge Events in Orinda](https://allevents.in/orinda/challenge) - [challenge Events in Moraga](https://allevents.in/moraga/challenge) - [challenge Events in San Francisco](https://allevents.in/san-francisco/challenge) - [challenge Events in Lafayette](https://allevents.in/lafayette-ca/challenge)