Scott,
Do your usual routine--that's why they keep bringing you back. Good advice above as well. Avoid ballads, slow songs that make reference to death, dying, home, etc.., all of which are depressing to those who have been warehoused to await the Grim Reaper.
One of the things I pride myself in is I know the names of many of the individuals I perform for in the nursing homes, assisted living centers and retirement communities. I shake their hands, give them hugs and have a wonderful relationship with my audiences.
The sincerest form of flattery is when the AD comes up and asks if another performer can sit in the audience and watch the performance. This has happened to me on numerous occasions during the past few years. Those same ADs also book me a year in advance and have given me pay increases regularly.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)