Hey Brian!
In a NEWS post in the TV/Group, Danny mentioned that he is going to do IMPROV "whenever he felt like it," which is now once a month it seems. Here is the schedule for the next few regular shows:
Wed, March 2nd, 1:00 PM pac Pardon Our Blunders w/ IMs Rensch and Pruess
all members
Fri, March 11th, 1:00 PM pac Chess Improv w/ IMs Daniel Rensch
plat+diam
Fri, March 11th, 3:00 PM pac Pardon Our Blunders w/ IMs Rensch and Pruess
plat+diam
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Blunders is usually once a week, while Improv used to be before all of the tourney coverage and added broadcasts. Anything new like shows, broadcasts etc will first be announced in the TV Group before they go public. 
-Mark
This was posted originally by IM David Pruess in the Official Chess.com/TV Group forums:
hey group,
we want to increase the number of people who watch/follow Chess.com/TV. One of the best ways to get new viewers is to bring them in during our free broadcasts. tomorrow we have TWO free broadcasts.
we have GM Bojkov covering a live tournament in the morning at 5 AM Pacific/8 AM Eastern/1 PM London(fide women's grand prix), and we have a special episode of pardon our blunders at 1 PM Pacific (4 PM Eastern/9 PM London).
so-- let your friends know that tomorrow is a good day to check out Chess.com/TV. and in the future when you see we have free shows, we would appreciate you inviting your friends to watch then too! any friend who watches and tells you they like chess.com/tv, i would then suggest you encourage them to join this group, so they can then get notices in advance from Mark (ChessMarkstheSpot) when other free shows are upcoming.
thanks!
-David
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So make it a point tomorrow to let everyone know about the two free shows and join the Official Chess.com/TV Group for more information on the Hosts, special PGNs and Content, and much more.
-Mark