Mayhem has a good point. It really depends on the party.
If the party is say "Ugly Sweater", and the sweater has a hole with a breast sticking out. I would approach her and mention that she looks cold, and it it is OK for me to attempt to warm her up.
Similarly, if a lady were to mention something about my swelling. I "might" reply, "Perhaps you have a technique for said swelling??" And before you know it, someone shouts, "Santa is getting a BJ in the kitchen!!!!"
And now we are not allowed back to Apple Bee's :(
Really though. Most parties start at 8pm. We mention to our "regulars" playtime 10pm?? OK, playtime 10pm. We go down in a group, many of us bringing another couple. and presto, Instant Orgy. Just wait, and the party grows....
Set a time that you would like to play. Search the crowd for potential candidates. As you near that time, say 30 minutes before, ask, "Do you want to play tonight?" We prefer "Do you want to FUCK." Since Play =/= FUCK to everyone. If its a NO, then move along. We used to wait until midnight, and we found we were playing alone. People are there because its a swinger's party. If you offend, then they weren't right for you anyway.