Saw an interview with Maroon 5.  One night they were reminiscing about their start up roots (playing wedding receptions & sleeping on apartment floors LOL). 

So they decided to prearrange with wedding reactions venues to "crash" their wedding reception scheduled for 12-6-2014 and NOT publicize it. 

Look mat the faces on the brides of sheer joy when the curtain comes down (not staged).   Way cool by Maroon 5.  And the Asian dad has moves LOL!!