A casual dance engagement accompanied by live music
The Niagara Falls Fling is the name the school dance in the Season 1 episode "School Dance". Amanda Lopez was chairperson of its decoration, snack, and entertainment committees. She assigns Lydia to have fun for her so she can marshal the event until she is sure that everything is going smoothly. After Vinnie Dakota and Balthazar Cavendish show up to gather information on Milo Murphy (with wooden stakes that are for their latest pistachio mission), Chad Van Coff comes to the conclusion that they are vampire hunters after Mr. Drako.
The image gallery for Niagara Falls Fling may be viewed here.