They are still up on the website and on the tickets, so I would say they're still confirmed.
However; I'm meeting -
Sacha Dhawan - getting my doctor who monopoly board signed by him.
Christopher Eccleston - same as Sacha Dhawan's auto, getting him to sign my doctor who monopoly board.
Ernie Hudson - getting my Ghostbusters LP signed by him (and if I feel confident enough, may get another one for him to sign my Spirit Halloween proton pack! ...idk though lol XD)
Clark Gregg - I don't know what I'm gonna get him to sign. I'm gonna see if I can get the Marvel Phase 1 collectors edition for him to sign.
Ming-Na Wen - same as Clark Gregg, though I may get two autos and get a Mulan poster for her to sign since she did the voice of Fa Mulan.
Meat Loaf - getting him to sign my MEAT LOAF: Hits Outta Hell LP.
Sam Humphries - getting him to sign my Greatest Showman LP.
Alice Cooper - getting him to sign his "Alice Cooper: Classiks" LP.
That's all at the moment, hopefully there'll be more confirmed that I'll want to get.