Lag BaOmer
May 26, Sunday
According to some Rishonim, it is the day on which the plague that killed Rabbi Akiva's 24,000 disciples came to an end, and for this reason the mourning period of Sefirat HaOmer concludes on Lag BaOmer in many communities.
According to modern kabbalistic tradition, this day is the Celebration of Simeon ben Yochai and/or the anniversary of his death. According to a late medieval tradition, Simeon ben Yochai is buried in Meron, and this association has spawned several well-known customs and practices on Lag BaOmer, including the lighting of bonfires and pilgrimages to Meron.
Additionally, in modern-day Israel, the holiday also serves to commemorate the Bar Kokhba Revolt against the Romans.