The event: a "flash mob" singing the Hallujaalh Chorus! (Flash mob = when people set up a time to gather in a public place (usually a mall, food court or airport) and sing something to the unsuspecting shoppers or travelers.)
I spotted one lady from my church choir and a flying buddy who is also a singer in the video.
How neat it would have been to have been sitting there in the food court sipping a Coke and then have this break out!