Uh-oh. Well, you knew this would happen. It's a full evening of songs made famous by Mariah, and the diva herself is sitting mere feet away from you. The temptation here is to dress like Carey in low-cut, super sequiny pieces as you attempt to belt out "One Sweet Day" — but don't go there. No one can out-Mariah Mariah. Just wear dramatic jewel tones, velvets (one of her faves), and something oh-so-her as a respectful accent. Honestly, there's nothing more Mariah than her "Pink Yet Lavender" polish with glitter stars and hearts. Nothing.

OPI Pink Yet Lavender Nail Lacquer, $9, visit opi.com for more information; Mason by Michelle Mason Silk Crepe de Chine Jumpsuit, $565, available at Net-A-Porter; Nicholas Roxanne Thin Gold Plate Belt, $120, available at Shopbop; DANNIJO Zura, $345, available at DANNIJO; Jasper Conran Royal Blue Suede High Heel Pointed Toe Court Shoe, $70, available at Debenhams.