Shine the Harry Potter signal! Equus, the hit London play starring rapidly budding heartthrob (maybe?) Daniel Radcliffe, will begin previews Sept. 5 at the Broadhurst Theatre, replacing the acclaimed revival of Cat on a Hot Tin Roof. Playbill reports that opening night is scheduled for Sept. 25, and the production will play a 22-week engagement through Feb. 8, 2009. Tickets go on sale to American Express Gold Card members on April 12 at 9 a.m. by calling (212) 239-6200 or by visiting http://www.telecharge.com. Set your alarms, you muggles.