Related Clues:

• Social event
• See 18-Across
• Cut a rug
• Samba or mambo
• Get down
• What flames may do
• Choreographer's creation
• Juilliard major
• Trip the light fantastic
• Hint to the start of 17-, 31-, 46- and 61-Across
• Hop
• Mazurka, e.g.
• Macarena, e.g.
• Ball, e.g.
• Have a ball?