Here's an idea: Have a School's Out Party. And host a burn-your-homework bonfire. Tell students to bring all of their school work from that year-- Add it to your blazing bonfire and take a whiff of that sweet sweet smell of academic liberation. Cook some hot dogs and burgers or just provide chips to snack on. Get some coolers filled with lemonade or soda and set up a net for volleyball. Set out some buckets filled with water balloons and let kids use them as they wish. Offer a raffle prize for students that fill out a contact form (that way you have some contact information from your guests). Play music through some speakers and let your students enjoy the night.