I spoke in school about graduation and it was something on these lines:
What is the point in a graduation party? Is there anything we can take out of it…?
A graduation is also called a ????? ?????. The ???? of ????? we see by Shmini Atzeres, where HKB”H says ??? ??? ???????.
Shmini Atzeres has no mitzvos. The reason why is because we run through Elul, the Yomim Noraim and Succos, reaching ??????? in ???? ? and ???? ?. In life, we run through higher and higher, but if one does not stop to think, stop to internalize everything, it all will fly out of the window. We need one day to stop and take everything we achieved through the last months and get us ready for the coming year.
(Blah blah…)
The same is true – we have raced our way through school/Yeshiva… we need one day to stop and take all the lessons that we have had over our lives and prepare for our future lives.
(something on these lines, and then I tied in Hakoras Hatov somehow, don’t remember how, and said a nice Moshol about Hakoras Hatov, ending off by thanking all the teachers and our parents for everything…)