From a few sources!
"Although some of the bigger names on the show, including Steve Carell, who plays Dunder Mifflin’s goofball regional manager Michael Scott, and Rainn Wilson, his overzealous assistant, Dwight Schrute, aren’t confirmed as attending, that doesn’t mean, for sure, that they won’t be here. There are more stars “to be announced,” said Sara Hailstone, the executive director of Scranton’s economic and community development office. She also said earlier that some of the show’s writers may be on hand for question-and-answer opportunities."
"Sales progressively tapered off as the day wore on.
By 3:40 p.m., the tally was at $63,900.74, Ms. Timlin said.
The vast majority of tickets purchased came from fans far removed from Northeastern Pennsylvania, with most opting for the convention's top-tier $100 and $250 passes."