August 27. update
Game of Thrones: David Benioff, Dan Weiss, George RR Martin, Nikolaj Coster-Waldau, Birgitte Hjort Sørensen, Kit Harrington, Sophie Turner, Maisie Williams, Charles Dance, Gwendoline Christie, Pilou Asbæk, Oona Chaplin, Natalie Dormer, Sean Bean, Aidan Gillen, Emilia Clarke, Frank Hvam, Esmé Bianco, Bella Ramsey, Rory McCan, Charlotte Hope, Hannah Murray, Harry Lloyd
LOTR and The Hobbit: Sir Peter Jackson, Sir Ian McKellen, Viggo Mortensen, Stephen Fry, Martin Freeman, Cate Blanchett, Liv Tyler, Orlando Bloom
Star Wars: J. J. Abrams, Daisy Ridley, Adam Driver, Felicity Jones, Mark Hamill, Billie Lourd, Domhnall Gleeson
Stranger Things: Winona Ryder, David Harbour, Charlie Heaton
Vikings: Katheryn Winnick, Travis Fimmel, Gustaf Skarsgård, Morgane Polanski
The Magicians: Olivia Dudley, Rose Liston, Kacey Rohl, Jason Ralph
Hotel Transylvania: Adam Sandler, Selena Gomez, Fran Drescher
Other: Sir Patrick Stewart, Margot Robbie, Cara Delevinge, Seth MacFarlane, Linda Harrison, Leonardo Dicaprio, J.K. Rowling, Bill Nighy, Lars von Trier, Lucy Liu, Sofia Vergara, Grumpy Cat/Tardar Sauce (not really a person, but one can hope)
Notes:
I've probably forgotten some I want to meet, and might add more later.