Can you say something beforehand?
Say to A "I'm really looking forward to tonight, I just hope B and C don't start with their 'jokes' because I really don't find it funny."
Say to B "Im really looking forward to tonight, I just hope A & C don't start with their 'jokes' because I really don't find it funny"
etc
And hope that they all get it.
Or fight fire with fire and 'joke' right back.
Or make no comment at all, simply carry on talking, or change the subject.
Or give them a bored, slightly patronising smile and talk about politics
Or laugh and say oh, here we go again, Pile in on Autumn, knock it off guys, and laugh again
Whatever you choose to do tonight, you're going to have to be assertive and tell them all to pack it in.