Someone's home, sometimes the GM's and sometimes a player's.
I have a regular game on Wednesdays which is almost always hosted by a particular player. Sometimes he GMs, but usually not. I have another mostly regular game on Saturdays, which has recently mostly been board games as we lost one player to family/time stuff, which is hosted at my apartment (mostly because Frosthaven's not going anywhere else). There's also an intermittent game (about 1/month or so, though we've been on hiatus over summer) that sometimes is on a Saturday and sometimes a Sunday and is hosted by one of the two GMs running games.