How About Not-Quite-Advent Calendars?

Our household is currently enjoying a few different Advent calendars, with daily treats from IKEA, cheeses and hot sauces from Aldi, and Professor Charlie's World Tour. And I've drooled over the various LEGO Advent sets in stores. For gamers, I know of companies who offer their own "dice set a day" Advent calendars.

As much fun as we're having with these, I'm curious: Why hasn't the idea caught on the rest of the year – even on a personal level? 

I imagine this lack outside of December has to do with logistics, mass production, etc. But it could also be that no one's considered the possibility. Maybe I should put on my thinking cap and see if I can come up with a "month of amusement" for loved ones in my life, to keep a birthday or anniversary celebration going for 12-30 days. Hmmm . . .

-- Steven Marsh