Official Madonna Day

By Stephen M. Silverman

05/15/1998 at 12:00 AM EDT

In what is being billed as a first, an official Madonna convention, supported by her Warner Bros. recording label, is scheduled to be held this coming Sunday at The Hollywood Palace on Vine St. in, well, Hollywood, according to the Web site for the $25-per-ticket event. (Warner Bros., like PEOPLE, is part of AOL Time Warner.) The 7 p.m.-1 a.m. gathering, which is meant to commemorate the pop star's 18-year career, is expected to include dance contests, a lookalike competition, and an auction of Material Girl memorabilia (including autographed pictures and costumes from Madonna's videos) -- but no Madonna, 42, despite the fact that she is expected in Los Angeles this week to do the opening number at Wednesday night's Grammys. In lieu of the star herself, Viva, said to be Madonna's favorite impersonator, will appear.