The mascarade

In the old days someone came to a dance during the worldcon with a costume inspired by the movie “The day the Earth stood still”.  It was the first occurrence of a costumed participant.  Somebody said to him at this time : I’m afraid it will catch.  There is a mascarade and costumed people since then.  My picture are not very good because of the number of people in the room.  If you have the chance to go to a worldcon one day, you must attend to the mascarade at least once.