The 33rd day of the Omer count is a festivel day on the Jewish calendar-Lag Baomer. We celebrate the holiday outdoors: The children traditionally play with bow and arrows and bonfires. Many visit the resting place of Rabbi Shimon Bar Yochai (in Miron in Northern Israel.) who lived in the 2nd century of the Common Era, was the first to publicly teach the mystical dimension of the Torah known as the "Kabbalah,"
On the day of his passing, Rabbi Shimon Bar Yochai instructed his disciples to mark the date as "the day of my joy". So each Lag BaOmer we celebrate Rabbi Shimon Bar Yochai's 's life.