There are definitely some houses that do this and it’s always nice to see!! Most don’t though. Being tapped into the food allergy community because of my son, this is the time of year I start seeing people urging their communities to offer allergy friendly treats. Personally, I like to have my own as a backup, and when a family says they have stickers or something, I thank them and he comes out picks from what they have (which is more fun for him for sure!) But having our own treats is a good way of insuring a toddler has a great night with lots of fun memories with his sister, and doesn’t get frustrated by a lack of options if there aren’t any for him.