The Lag B’Omer holiday marks the 33rd day of the 49-day period between Passover and Shavuot. This 7-week period called “the Omer” (a unit of measure) is traditionally a quiet time on the Jewish calendar, but Lag B’Omer, which occurs on the 33rd day is an exception. Bonfires, outdoor parties and revelry rule the day, which is also a popular Jewish wedding date.