One Day Only?

I've become fascinated with the concept of the "One Day Only" sale.  Often there's a "preview day" the day before the big day.  Isn't this just a two-day sale?

I'm going to use this idea to my advantage.  When my bitchfest drags into a second day, I'll just say day one was "preview day".  And when I wake up on day three itchin' to bitch, well, I'll just say that due to the successes of "preview day" and "the big event", it's been extended for another day.