Not to fear. As soon as I uttered the phrase "gluten free," the waitress offered to bring me some gluten free crackers from the back (one of the employees eats gluten free).
I recognized the seed-encrusted, dark-grained gluten free treats as "Mary's Gone Crackers" brand: a bit of a meal in themselves!
By the way, for those who can imbibe in gluten and all manner of allergens, I was impressed with the mountainous-looking portions of seemingly-delectable pie that others ordered. Yeah, Harvester!