Mark Millar is offering comics retailers a chance to win a free in-store appearance by him.

All store owners have to do is encourage their staff to dress up for Free Comic Book Day as Millarworld characters, anyone from Kick-Ass and Hit-Girl to Nemesis and The Fox. Then take photos and email them to Millar no later than noon GMT (5 a.m. PT) on May 8.

The writer will announce the winner on May 11, and will cover his own expenses to travel to the store later this year for a signing.

Millar held a somewhat-similar promotion in 2012, only that time the store that ordered the most copies of Supercrooks #1 won the free in-store appearance. The National Bookstore in the Philippines, emerged victorious, and Millar chronicled his experience there in a travel diary published on CBR.