Cathy and Nancy,
Thanks for the kind replies!
I am feeding about 15-20 people but most everyone wants (translation: fights over) the pie leftovers to take home. Cherry is particularly hotly contested, as noted in OP.
Cathy: Good idea on the frozen cherries for next year. I should have done that myself, when in Traverse City, but I had no cooler on that trip and it was a hot drive, so I passed 'em up. By the way, I've had no trouble locating rhubarb out of season. Treasure Island usually carries it, as you mentioned.
That said, Nancy, I'd happily take you up on your offer, if it wouldn't put your parents out too much. I'd love to reimburse them for their precious harvest, as well. I'm in Evanston. Have car, open schedule for now. Maybe you could send me a pm if your folks are on board. I am touched by your kindness!
Man : I can't understand how a poet like you can eat that stuff.
T. S. Eliot: Ah, but you're not a poet.