Same idea, smaller humans. A baby rave is a daytime dance party built for the little ones, and it is the easiest room I ever work. Nobody that age has learned to be embarrassed yet. The music goes on and they go.
Volume comes down, the lights stay friendly, and the floor fills with bubbles, balloons, confetti and a fog blast that gets a scream every single time. Parents dance too. That is not a bonus, that is the point. It is a family event, not a drop off.
Schools run these as kindergarten welcome events, early years family nights and PAC fundraisers where the little siblings finally get something of their own. Community centres and street festivals book them for the same reason.