Begins at sundown on May 25.
Lag B'Omer, the 33rd day of the Omer count, is a festive day on the Jewish calendar. It is celebrated with outings (on which the children traditionally play with bows and arrows), bonfires, and other joyous events. Many visit the resting place (in Meron, northern Israel) of the great sage and mystic Rabbi Shimon bar Yochai, the anniversary of whose passing is on this day.
Rabbi Shimon bar Yochai, who lived in the second century of the common era, was the first to publicly teach the mystical dimension of the Torah known as the “Kabbalah,” and is the author of the basic work of Kabbalah, the Zohar. On the day of his passing, Rabbi Shimon instructed his disciples to mark the date as “the day of my joy.”
The chassidic masters explain that the final day of a righteous person’s earthly life marks the point at which “all his deeds, teachings and work” achieve their culminating perfection and the zenith of their impact upon our lives. So each Lag B'Omer, we celebrate Rabbi Shimon’s life and the revelation of the esoteric soul of Torah.
Lag B'Omer also commemorates another joyous event. The Talmud relates that in the weeks between the Jewish holidays of Passover and Shavuot, a plague raged amongst the disciples of the great sage Rabbi Akiva, “because they did not act respectfully towards each other.” These weeks are therefore observed as a period of mourning, with various joyous activities proscribed by law and custom. On Lag B'Omer the deaths ceased. Thus, Lag BaOmer also carries the theme of the imperative to love and respect one’s fellow (ahavat yisrael).