Met and talked to:
- Todd Newton (a couple of times after TPIR Live! events, he was very nice)
- Frank Nicotero (very brief conversation after a taping day of Millionaire in Las Vegas)
- I think I said "hi" to Donny Osmond as he walked passed us backstage at a Donnymid mall event, but if I did we didn't actually have any real conversation beyond that.
Game show host-adjacent conversations with:
- Charlie O'Donnell (during some down time on a Wheel taping in Vegas)
- Randy West (a couple of occasions)
Seen in person but didn't get to talk to: Regis, Chris Harrison*, Monty Hall**, Mark L. Walberg, Howie Mandel, Pat & Vanna.
*I did talk to Harrison as a contestant on the long-forgotten GSN original Mall Masters at Mall of America, but per the OP that doesn't count for this thread. I included him in the list though since I also attended a Millionaire taping where he was the host.
** I certainly tried to meet Monty after he hosted a Let's Make a Deal event at the local casino many years ago. When the show was over I went up to the stage as he was starting to walk away in the hopes of being able to say hi. Despite the fact that I could still see him at the edge of the stage, I was told that, "Mr. Hall has already left.", and that was that.