Notorious “orgy” organizer Palagia has been banned from throwing her monthly sex bashes at the Chelsea Hotel. After throwing wild parties at the iconic location for 11 years — allegedly attended by actors, musicians and TV personalities, as well as some hotel residents — the 37-year-old Greek Madonna look-alike was notified her reservation was canceled just hours before her April 30 bash “due to liability.” Hotel manager Arnold Tamasar told Palagia in an e-mail obtained by Page Six: “We would advise not to book any reservations under your name or alias . . . We are not honoring your reservation for today or future.” Palagia’s rep blamed the ban on an impending change in ownership of the hotel. It’s allegedly in contract for $80 million, but the buyer remains a mystery. “Managers used to come to the party,” her rep told us. “That’s the saddest part because her parties are legendary. The Chelsea is her favorite location.” Palagia was out of the country and couldn’t be reached.