For my third year (ninth grade) students, we had a farewell party last week, which lasted two hours. They called it a party but it included one hour of singing, choir style (each grade to each other), half an hour of cheering (thank god the cheerleading system is completely different), and video and pictures of the kids from their first year to their third.
Also much to my surprise, the teachers "sang" a song which included changing into ridiculous costumes, busting out an electric guitar, and rapping.
Also, we had a special end-of-the-year ceremony for our three deaf students. We have one in each grade-- first, second, and third. Two things surprised me: first, there was no sign language. The teachers and principal spoke to the students almost as if they were no different from any of the other students. As part of the ceremony, the students each had to deliver a speech about the year. When one of the girls didn't see/hear the principal call her name, he gave her a two minute lecture on not paying attention right in the middle of the ceremony. It seemed a bit absurd to me, but the principal runs the whole school like that.
Lastly, we've been doing the year-end cleaning, which runs about forty minutes each day. It mainly includes scrubbing the floors with sponges and little rags-- instead of mops, we use the large number of students (and teachers) to get the job done.