Singer Mariah Carey will headline at the European debut of SIR Elton John's charity concert One Mighty Party. The Without You hitmaker will travel to Paris, France for the gay and lesbian concert which benefits the Elton John AIDS Foundation on 29 June (07). Johnny Chisholm, founder and producer of the One Mighty Weekend events, says, "Mariah Carey is a worldwide musical superstar and we are thrilled to host her at our party." The One Mighty Weekend has been held at The Walt Disney World Resort Orlando for the past 14 years but will make its European debut in France.