Glow in the dark water balloons---- A water balloon fight during summer would not be an unwelcome event! But, a water balloon fight in the dark on a hot summers night would be fun and would cool you down.
Glowstick ceiling fan, decoration ssssssssssoooooooooooooooooo doing this! Depending on how many people are at my party, We could sleep in the living room and do this. But our fan has like 2 speeds, slow and fast-enough-to-whip-off-glowsticks
Glow-In-The-Dark Baseball! The Greatest Game Ever Played!