Okay, my turn...
Randy West- Twice... once around 2001, at the now former NBC Studios in Burbank, where Chris Jaunsen and I saw the Louie Anderson Feud set, the O'Hurley TTTT set, both in the same studio, and the Supermarket Sweep set in studio 9 I think, as well as The Weakest Link in Studio 1. He was a great tour guide. The second time was a year later, in 2003, on my birthday, where my brother, his wife and I all saw a taping of TPIR and he was announcing.
Bob Barker- In 2009 in NY for a book signing. He was uncharacteristically quiet and barely spoke, likely because there were many in line and he had to sign several books before flying back to CA.
Marc Summers- In 2017, twice. He was at a local ice cream place in Baltimore to meet and greet fans, where I shot a brief video with him, then the very next day, I got a picture with him after a showing of his documentary, with Pat Sajak interviewing him. Didn't get to meet Pat as he left before the movie ended.
Roger Dobkowitz and Rich Fields- 2007 at Bob's last show.
Stu Kerr- local Baltimore personality. He wasn't exactly a game show host, but had a call in show where he tried to call local people to give away prizes, it was called Dialing for Dollars. Stu was best known for having a number of children's shows. One show did have a series of games, but all played for fun, called Pop's Place. My brother interviewed him for a school project. Lots of great stories. One was on his shows, he would announce children's birthdays, then instruct that child that there was a special present hiding for him. In reality, the kid's Mom or Dad sent Stu a letter telling him where their child's present would be hiding. He got one letter from a mother whose daughter he surprised by telling her to look behind the blue couch for a surprise gift. She realized, at that point, that Stu could see her! From that point on, she never wore her pajamas in front of the TV set again!