Starting at the second seder on Pesach, we count the days of the Omer eagerly anticipating Shavuot, the celebration of matan Torah — of recieving the Torah on Sinai.
But until the 33rd day of the Omer — Lag B'Omer — we also observe mourning rituals in memory of the 24,000 students of Rabbi Akiva who died because they failed to show show proper love and respect to one another. Those rituals include refraining from cutting hair, listening to live music and having weddings.
To symbolize these rituals we cease to observe on Lag B'Omer, our Lower Schoolers participated in several high-energy relay races:
A baton race using strings of hair=getting hair cuts again.
A baton race using T-shirts as wedding wear = celebrating weddings again.
A tambourine over/under race=listening to music again.
Plus one race where students had to carry woodchips on a spoon, representing the bonfires customarily held on Lag B'Omer.