Can there be anything easier than to make a documentary about school kids facing off in some sort of eccentric competition? Establish the ground rules, turn the camera on, let the children be themselves: Presto, instant insight into embattled innocence and native wisdom. ''Spellbound" (2002) did it with spelling bees, ''Word Wars" (2004) did it with Scrabble, and now ''Mad Hot Ballroom" does it with ballroom dancing.
Thing is, it works.
Filmmakers Marilyn Agrelo and Amy Sewell haven't made a film as resonant, rich, and focused as ''Spellbound," but they've still delivered a heartwarming experience about the New York City public school system's ballroom dancing program. Begun over a decade ago and now involving 6,000 fifth-graders in 60 schools, the after-school program leads up to an all-city dance competition held at the Winter Garden in the World Financial Center.