Lead an activity or game for a 1 hour to get together with OLE families. Run the idea by the PTA as well as budget. Have fun!
Examples are:
Open GYM
Dodgeball
Board games in the lunch room (pictionary could use the white boards)
Earth day theme - seed balls
Leading a craft in the lunch room (check with PTA for existing supplies)
Movie night in the gym (one night could be geared towards younger grades, one night geared towards older grades)