Plan to have a great time! Seriously, this is not a show for the "fly on the wall" type. You can hang out and just watch, but in large, the show is about the audience! The cast does a great job of developing characters from within the audience and they do a great job of going with the flow, their improvisation is key.
I panned this evening as for a date and we both had a blast. We found ourselves to be the most outgoing people at our table, but by the end of the night...and after a few drinks, everyone was having a great time! I cannot wait for the next show!