A good example is sports in the park.

Sometimes I’ll just sit in the park and watch a baseball game. Idk who they are, but it’s a free and go “red team”… This summer I watched cricket in Van Cortlandt park. No idea what was going on, so I talked to some of the guys (mostly south Asian), it was interesting. And of course there are always soccer matches to be had, and you probably walk past them all the time, but stopping a being a spectator is a surprising amount of fun