I’m in currently one group, and several players run us through their game on alternate weekends - currently rotating through two different games. One’s every 2nd weekend, the other is as the DM gets their content prepared (about once a month). About 3 weekends ago, a third player ran us through his initial game; we’re unsure it will become a regular game, though I wouldn’t mind it (waaaaay better than the Tomb game that’s ongoing).
I’ve been hankering to rekindle a game with a former group, running a Spelljamming game if possible - but after completing our Saltmarsh campaign, they might want to do something else.
Finally, I also do “guest” DMing for my eldest son’s group, usually on holidays. I did a SAGA Star Wars a couple months back - and hope to do more in that same game soon. I also did a Ravenloft Falkovia last November, and an Alien one-shot some time ago with my Saltmarsh group.
I was supposed to do a biweekly D&D game with my brother and one of his friends, but it looks like they started without me.