The meal-sharing apps were hit and miss. EatWith, BonAppetour, VizEat, and AirDine always came back empty in smaller cities. There were just no hosts. I eventually found two last-minute hosts on VizEat in Lyon: one, a jazz musician, cooked me an awesome burger, and the other, a Thai guy and his boyfriend, made some delicious Thai food.
In terms of looking for fun things to do, Vayable yielded no results. I even branched out into other sites, like Withlocals and Airbnb Experiences, but those were all duds too. I was left to play the traditional tourist, though I did spend my last morning in Lyon walking around with a retired teacher from the Global Greeters program.