Jews all over the world will celebrate ‘Lag B’Omer’. ‘Lag B’Omer’ is Hebrew shorthand for the 33rd day of the ‘Omer’. ‘Lag’, or L"G is the Hebrew numerals for 33. It falls on the 33rd day of the counting of the ‘Omer’ (the amount of days as counted from the second day of ‘Pesach (Passover) until the holiday of ‘Shavuot’.) This corresponds to the 18th day of the Hebrew month of ‘Iyar’.
Read more on the Jewish Celebration page