Since my list goes back over 50 years, I'll try to keep it brief:
Attended tapings in NYC (the ones I remember):
SAY WHEN, CONCENTRATION (DOWNS AND CLAYTON), MATCH GAME, CALL MY BLUFF, REACH FOR THE STARS, MUSICAL CHAIRS, HE SAID SHE SAID, PASSWORD, JEOPARDY, THREE ON A MATCH, WWW, PERSONALITY, SALE OF THE CENTURY (JACK KELLY), TTTT (COLLYER, MOORE), WHAT'S MY LINE (BRUNER AND BLYDEN), JACKPOT, BLANKETY BLANKS, MONEY MAZE, BIG SHOWDOWN, $10,000 PYRAMID, $25,000 PYRAMID (Clark and Cullen), MDP
On an NBC tour in NY saw the set for DOUGH RE MI
Attending tapings in LA:
Super Password, Match Game 2008 (pilot)
Tried out for CONCENTRATION, JEOPARDY (Fleming),WWW, JACKPOT, WINNING STREAK, WOF, PYRAMID, MILLIONAIRE, MDP
PLAYED ANYONE CAN PLAY (Anderson) and won the jackpot!
With Weatherman and GSFan, did the development run-throughs for MDP last winter.
Professionals I've met (while trying to pitch games years ago): Howard Felsher, Ira Skutch, Ronnie Greenberg.
But my biggest (and fondest) connection was when I pitched a show to Ronnie G. that he liked and developed, that was picked up as a pilot by NBC as WordGrabbers (1976), and that allowed me to participate in the pre-production and taping and take home a copy with my name on the crawl as creator.