It's not a single political front, they have members (those who sponsor hosting), they decide by vote

In the left-wing spheres here, terms such as "political act" or "solidarity" are just bloat used to make your message sound more left wing. It's a faux pas not to virtue signal in a way that sounds radical and ensures that it won't affect anyone from outside your bubble as well.

An example from recently would be posters for an expensive kinky rave in Berlin offering discounted "solidarity tickets" for refugees, trans folks, sex workers, and BIPOC people. The dress code alone ensures that it's only friends of friends using these labels who will get in anyway.