

Your nearest, biggest city’s library is a good place to look. Libraries almost always have something going on in a spare public room or have public event flyers hung up. If you’re interested in politics, going and yelling at city council is a great way to meet local activists.
I’ve never met a public-facing tabletop group that wasn’t enthusiastic to introduce new people to it. I think honestly my worst experience was when some dude brought his insanely broken D&D 3.5 character to play in a level one 5E game. The DM handled it very well; much better than I would have, I think.