Not sure if this would work nowadays as I haven't performed at a senior home for over 20 years but my previous wife and I used to close with (Shimmy Like My) Sister Kate. During the last chorus my wife would get up and do a flapper dance ala Betty Boop and that just slayed them. If it was an evening show we'd close with Goodnight Irene or Old Black Joe to send them to bed as they all seem to know the words and would sing along. This sure brings back a lot of warm memories.