The Mid-Atlantic AI Alignment Alliance's first unconference was in February and contained

https://www.lesswrong.com/events/fqha7yX28KyN7eK6v/mid-atlantic-ai-alignment-alliance-unconference

Won't necessarily resolve YES if someone organizes a bring-your-own-food meetup of less than 8 people on the discord. If a funder endorses a meetup that gets more than 8 people, we might call it an "unconference" retroactively. If an event has curated talks, it needs at least a 3 hour block devoted to unconferencing if this market is to resolve YES on that event. 

No city in particular is required. "an MA4 event" can really be any event advertised in the MA4 discord. 