From the blogspot of a concerned parent:

It was actually worse than the pictures make it out to be. He processed into mass behind the cross wearing the Mickey Mouse hat and a gold masquerade mask. Once the singing stopped, the first thing he did was blow a kazoo and say, “Happy Mardi Gras.”

This event occurred at the RIT Newman Center Mass.

You can read the rest and see photos at the blogspot of the Corning Curmudgeon. I will entice you with these words: Super-soaker with Holy Water, tie-dyed vestments, gold masquerade mask.