IDK about bitcoin but in monero we have a weekly poker night (22:00 UTC) operated by /biz/ users over tor, IDK I've never tried it though:
It's a good idea to implement in bitcoin I guess especially now that there's lightning. The problem is that there isn't a lot of plausible deniability, but maybe some multisig magic could make it work.
If someone figures out how to do it with provable fairness, maybe you could advertise it as a bitcoin community event.