You shouldn't need a holiday to be thanking your customers. Here is how you can start thanking customers! Consider Sweet Fortune Cookies for your on going "Thanks!" with custom Thank You Fortunes inside!
Bucket List: Watch all of the Harry Potter movies in one day. (It takes 46 mins with out factoring in time to switch out dvds and bathroom breaks, then if you want to get your self some food or anything else, you're looking at a good hours at least.