The next upcoming Lag BaOmer is celebrated/ observed on sundown of May 2 ending at sundown on Thursday May 3rd, 2018. Lag BaOmer in the Hebrew calendar falls on the 18th of Lyar. The day celebrates the death and life of Rabbi Shimon bar Yochai who was a Mishnaic sage back in the 2nd century.
Many on this day will take a pilgrimage to the town of Meron in northern Israel to the tomb of Bar Yochai. Others will celebrate the holiday by lighting of bonfires. Worldwide practicing Jews will hold parties, dance, listen to music and get haircuts on this day.
Too many this day relates back to when a plague ended after killing Rabbi Akiva (Rabbi Yochai mentor) and thousands of his students.