Ad:CBS’s Celebrity Big Brother took the last couple of years off, but the Winter Olympics have caused them to bring back the show as counter-programming—the same purpose the show served during its initial incarnation. It might be hard to remember, but Celebrity Big Brother is an abbreviated season that sees the celebrity houseguests compete over four weeks (around a third of a usual season). Don’t worry, though, because of the shorter amount of time, the show speeds things up to keep it fun. That does mean that the calendar is a bit hard to follow. Week 1Wednesday, Feb. 2: 8-9 p.m. (premiere) …