It turns out that Advent isn't a lost season after all, at least not for Australia's Alaskan Rock Vodka company, which is putting daily Advent cocktail recipes on their Facebook page.
The first two are The Twinkle and the Flatiron Martini.
I can't think of anyone ever using Advent as a marketing season, except for the publishers of Advent calendars and tracts.
[Don't look at me, I merely comment on contemporary culture; I don't invent it. Besides, I'm not much of a fan of fussy cocktails. If it requires more than an ice cube, it's too complicated.]