Some kids would love to go to school year round if they were given the option. How about an "early graduation" enticement?
Why warehouse lumbering adults in kiddy seats and make them ask permission to go to the bathroom? It's costly. Let's move them along as soon as possible, get them out the door at 14 or 15, to whatever the next stage beyond high school.
How about Summer camp? What about a festive learning experience during the summer?