- Church/temple/mosque/etc: worship - Bar: drinking alcoholic drinks - Gym/sport: physical exercise - Volunteering: whatever you're volunteering for - Coffee shop: coffee? Reading, working?
All these have "a thing you do other than socializing and meeting people". You could (and do) go there specifically for the activity without socializing and meeting people (just like church).
Spaces that are "social-only" are pretty rare. Coffee shops are maybe closer to that as you're probably not going to consume many coffees, but people stay to read, work... it's a bit less structured than other third spaces (and personally I find that it makes it more difficult to socialise there)
Also a feature of some churches - parties in the church hall, the university chapel I used to go to that had a church run bar in the same building!
More seriously, bars are primarily places to socialise that happen serve drinks so I think they are similar to coffee shops that way.