According to the poster of the vid, this took place on Sept. 18th in a N.J. neighborhood and this is what they had to say:
Went to a Big block party in West Orange..the same block where Jay Z mom lives. Jay Z and Beyonce went to visit his mom when the DJ start playing music, Beyonce came out to dance with the neighbors.Who wouldn't be nervous dancing next to Beyoncé? LOL!
Sidenote: The name of the dance is called 'Wobble' by VIC. Check it out here.