According to the LA Times Travel Blog:
Although Disneyland isn’t calling it a parade, the new “interactive street party” debuting March 27 will travel along the parade route, replace the outgoing parade and essentially serve as the daily parade.
In typical punctuation-challenged Disney fashion, Celebrate! A Street Party will feature seven floats and 90 performers in a “celebratory song and dance party.”
Banners and ribbons will connect the floats as if in a long chain, according to Screamscape, with periodic high points punctuated by confetti-cannon fodder. Cue the street sweepers.
The anti-parade will make at least two show stops — on Main Street U.S.A. and in front of It’s a Small World — where singers, dancers, stilt-walkers and Disney characters will shake and shimmy to party songs.
Similar in scale to the Parade of Dreams, which the new whatever-you-do-don’t-call-it-a-parade replaces, Celebrate! A Street Party will typically run twice on busy days and once on slower days.