Yes, I've been to a few.

Ask your host ahead of time. Just like everything between you and (preumably) Molly, communication is key. Once you ask, you'll know whether or not that particular party is one you want to attend... or maybe one you want to be the first one you attend.

The parties I've attended had rules about touching other peoples' equipment without permission v. rules about "house" equipment, rules about appropriate and inappropriate touching other people, rules about joining in on ongoing scenes, rules about having a scene unattended by a 'dungeon monitor, rules about alcohol, and rules about barrier protection (even if you're exclusive to the partners you arrived with.)

Some groups have required initiations... you may not be comfortable with that.... and some have requirements that you only observe the first 'n' times... and you may become bored with that.

There are so many variables... you really owe it to yourself to ask the host.