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Many Jewish people in the United Kingdom observe Lag B’Omer, also known as Lag BaOmer, on the 18th day of the month of Iyar in the Jewish calendar. The name of this observance means refers to the 33rd day of the counting of the Omer.
The name of this Jewish observance refers to the 33rd day of the counting of the Omer. An “omer” refers to a sheaf of barley or wheat. In the book of Leviticus, it is written that God commanded people to make an offering of a sheaf of barley on each of the 50 days between Passover and Shavuot. The day number was announced after the evening service, and in time this ceremony came to be known as the “counting of the Omer”.
The reason why the 33rd day of this period was singled out may have something to do with an ancient pagan festival that was celebrated at the same time. Another story claims that a plague attacked Rabbi Akiba’s students in the second century CE suddenly stopped on this day. Many Jewish people also mark this date by remembering the death of Rabbi Shimon bar Yochai, who was one of Rabbi Akiva's students. In any case, this observance represents a break in the season between Passover and Shavuot.