Glenn .. At my age (63) I don't envy you, although I would no doubt love it... Like Scott, I would be interested in the particulars of what the client's expectations are ... Will you be able to start out 'easy' with background music and then build up to a 'party' atmosphere?
If it were me, I would also set the height of the kb so that I could stand for a while,or 'rest' on my piano stool ... this way I wouldn't get 'stiff' in one position too long ...
Good luck, buddy ... no doubt you'll be great, and the crowd will love it ... Report back ...
t.
PS ... Also, if it were me there would be some serious arthritis meds before and after ...
t.