As all we know, Antenna TV is running old Johnny Carson Tonight Show episodes. To promote this, they staged a panel discussion about the show at the Museum of Broadcast Communications back in January. Talking about Johnny were bandleader Doc Severinsen, Carson biographer Bill Zehme, frequent guest Tom Dreesen and Jeff Sotzing, who is Johnny's nephew and the proprietor of the Carson archives. If you're as fascinated by this show as I am, you'll want to watch…