W Hotel SF Halloween International Ball on October 28th 2016 (Friday) 9pm to 2am at W Hotel San Francisco--Head over to the W Hotel for this year's Halloween International Ball. Starting at 9pm, enjoy three rooms of world renowned DJs and performers. Room one features Euro, Top 40, & International House Music. Room two offers up Persian, Middle Eastern, and other hits. Room three is the 80s, 90s, and Hip Hop Room. You can also enjoy amazing Samba Dancers, drummers performing live with the DJs, a costume contest with great prizes, and more.