Thailand's world-famed underwater wedding festival will no longer be a straight-lace affair, as gay couples will soon be allowed to join the annual event.  The festival takes place in Trang province every Valentine's Day.  Wichat Rattamanee, chairman of the Trang Tourism Association said the scuba-suit weddings, always well publicized by the international media, will attract even more tourists to Trang if the Valentines' vows are extended to non-straight couples.  However, the Thai ceremony will stop short of granting the mixed couples official marriage certificates, still not allowed under Thai law.  Rather, the gay couples will be given a certificate announcing that they are officially "lovers" instead.