What day is it again? Welcome to another day on planet Earth as an adult with a credit card. We have a selection of merchandise for your perusal, and a selection of special days on which we sweeten the deal: Black Friday, Small Business Saturday, Cyber Monday, Giving Tuesday—you take your pick, make a payment, and we’ll take care of the rest. In the new economy, every day is a Day, be it pi, pie, pancakes, pickles, or talking like a pirate. There’s a movement of some kind to designate a day for celebrating just about everything under (and also…