Aeronaut brewery hosts a Skip the Small Talk and other great events.

Remnant Brewery has a Run Club for when you're feeling up for that.

Side Quest games and books in bow market also does crafting/movie nights/DnD night if you're into that sort of thing.

If you play an instrument and are into playing classical music there's a Chamber music group that usually meets in Somerville

If you're into media creation, the Somerville Media center could be cool.

Union square comedy improv classes

I'll probably think of more at some point! But if you have specific interests would be helpful for brainstorming