The Grand Hyatt dusts off the mirrorball for the classiest disco party of the summer on August 2. Put on your dancing shoes and sashay into the Roppongi hotel's main ballroom for an evening of '70s grooves and free-flowing booze, with DJs Ai Emori and K-Co, plus live vocals from Bro. Kone and Tsunoda Hiro. If you're feeling extra plush, spring for one of the VIP tickets, which includes top-notch tipples such as Louis Roederer Cristal Brut 2005 and Henri Giraud Fût de Chêne NV. Revellers can also stay overnight for a reduced price of ¥25,000; call 03 4333 8838 for details.