Big news out of Small Press Expo 2011, which is going to get considerably bigger in 2012.

Comics superstars Dan Clowes and Chris Ware will be special guests at the next SPX, which will be Sept. 14-15, 2012, Executive Director Warren Bernard tells Comic Riffs on Saturday night at the packed event.

Clowes (“Ghost World,” “Wilson”) and Ware (“Acme Novelty Library,” “Jimmy Corrigan, the Smartest Kid on Earth”) both won the event’s inaugural Ignatz Award in 1997, and both have won multiple Ignatzes since (as well as a raft of other awards — from Eisners to Harveys, as well as an Oscar nomination for Clowes).

Bernard also announced that the exhibition space will roughly double in 2012. Good thing: The aisles were jammed as business was brisk Saturday in the North Bethesda Marriott ballroom space. Bernard said the day was on track to break attendance records; the 2010 event had more than 3,000 attendees and exhibitors over two days.

The 2011 event continues Sunday, featuring such guests as Craig Thompson, Roz Chast, Kate Beaton, Chester Brown and Jim Rugg.