I was banded on July 7th and I was fine to go on a cruise August 26th. Yeah I couldn't eat nor did I want to eat like everyone else, but I had no issues at all. You just have to make smart choices. Trick or treating might be pushing it a little bit. You will probably feel okay by then, but you will get tired really easily. I would still go ahead with the surgery because you will find out that it brightens your life in so many ways. You might have to miss out on one Halloween, but then you get so many other great days becuase of the surgery.