Night fantastic: Orquesta La 33, performing at Seseribó in Quito. BY NICK ROSENWhen you’re ready to migrate to the dance floor, Quito abounds with options. Bungalow 6 (corner of Calama and Diego de Almagro, in the Mariscal) is the most popular venue for visitors and expats, though it attracts a lot of rowdy, young locals…