The closing ceremony was at 5pm on the last day of the convention. This was when they gave out prizes to the winners of the AMV contest, cosplay event, raffle and many others.
However, the guests were only there until they finished gaving out prizes to the raffle, cosplay and AMV winners. On a side note, the winner for both 1st and 2nd place for the AMV contest is Pharcry. Congratulations, Pharcry.
YouTube - Closing Ceremony