Community theater is great for meeting people and usually basically free

If you have a university in your town often they will have some clubs that are open to the whole community and occasionally public lectures.

Museums and art galleries are usually pretty cheap especially if you keep your eyes open for the free stuff. I go whenever I see free stuff, or a new exhibit I'm particularly interested in.

I know people that do the indie concert scene, just going for any random concert under 20 bucks. Sometimes the bad ones can be just as entertaining as the good. you go to maybe 1 show a week and spend the rest finding the concerts and maybe listening to them on spotify/sound cloud.

Indie movie theaters can also be a vibe. Mine is about 10bucks a ticket, but sometimes they have a free night and sometimes a pay what you can deal. I go every month or so. Last one was a scooby doo one, it had a "cheer whenever they say scooby" game, a drinking game and the previews were funny clips about scooby (robot chicken and that sort of thing) it is a very social experience and a lot of fun. Not free but clearly not for profit.

I think the best thing is to just walk around more, and just be on the eye out for stuff that interests you. Actually read the fliers on posts, join local social media groups to find out what's up, keep an open mind and look to push your comfort zone and look out for local community stuff over corporate for profit stuff.