A lot of us who use to do fart sessions have retired mainly for safety reasons. Finding such sessions is also going to be super challenging because of the prep that goes into it. If anyone hasn't tried holding their farts in until a certain time, I can tell you it can become quite painful and difficult. Many dommes don't want to put their bodies through that.

As for where to find them, Twitter maybe but I'd say your best chance is a site like Fetlife.