When Isaac Hayes invites you to a party, you damn well better show up.The Oscar-winning soul icon (and current radio personality and voice of Chef on "South Park") is putting together his third annual "Salute To Soul" to mark his birthday on August 19. So far 702, Aretha Franklin, Queen Latifah, Smokey Robinson, Luther Vandross, and Savion Glover have made it onto the guest list. Betty Wright, Dionne Warwick, Mark Curry, Sam Moore, Cyrus Chestnut, and others are also expected to turn up at the benefit, which is set for New York's Copacabana on the 19th. The event, which has drawn as many as 2000 fans in past years, will feature live performances and a VIP reception, and will hopefully generate a mound of money for two of Hayes' favorite charities. Tickets for the shindig are going for $50 with proceeds benefiting the Isaac Hayes Foundation and the World Literacy Crusade.