There usually is an alert that pops up around 30 mins or so before the show actually starts OR you can join the Chess.com/TV Group.
I usually announce the shows the morning that they will happen and you can check the Chess.com/TV Page under "FUN" up top. Right now there are no shows on the schedule because Danny and Melik are going to be at a tournament in Las Vegas this weekend and I will announce in the Chess.com Community forum category once new shows are announced.
-Mark
Would be nice if each time chess.com tv starts we would get a better notification of it:) an alert ?