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The community-run Ethereum festival and hackathon in Denver.
ETHDenver was a community-run Ethereum festival and hackathon. The 2026 main event ran for four days at the National Western Center in Denver under the theme New #BUIDL City.
ETHDenver is one of the longest-running Ethereum community gatherings, built around its hackathon, which it calls the BUIDLathon. The 2026 main event ran from 18 to 21 February at the National Western Center, a new venue for the festival, after a few days of builder camp.
The theme was New #BUIDL City, and each day and stage was split into themed summits covering areas such as security, DeFi, policy and developer workshops. Observers noted that AI was a dominant topic and that the number of side events around the festival was far lower than in 2025.
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The festival moved to the National Western Center in Denver.
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Days and stages were organised into topic-based summits for the first time.
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The hackathon ran through the week and closed with judging on the final day.
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Reports from the event described AI and agents as the busiest topic on the floor.
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