Closing ceremonies mark the end of the convention, where people are thanked, and awards given. For some cons this is the last official programme item, others continue on a little after it. Generally less spectacular than opening ceremonies, closing ceremonies often feel that they must fill the entire hour usually allowed for it -- with dire results. For convention series where a different committee runs the convention each year in a different location, there is sometimes a ceremonial handing on the burden to the incoming committee.
A dead dog party is often held later for those not leaving that night.