New and need advice

My wife and I are happily married and we have fooled around with another couple in the past.
We have done some getting naked together, the wives making out, and some same room sex (with our own partners).
We are hanging out soon, for the first time in a long time. The plan is for drinks and crashing at their house. Any advice on how to get the party started and get back to having some fun together? Any games you recommend? Maybe even progress to a soft swap...