Totally understand.
Many years, school here in MA was not over until June 25th. It was torture, especially since schools here are not air conditioned. I always had lots of hands on activities and group things, but after May 15th, it was most of the work. My last big writing piece would be due no later than June 1st-5th. I gave lots of choice and lots of work for the last 2-3 weeks.
Riding to school 2 days a week kept me sane.