The fifty days between Passover and Shavuot, which should be days of joy and preparation for the Torah, unfortunately contain some mourning as well. This is one of the mysterious festivals of the Jews. During this period, music, haircuts and weddings are not allowed. This count is known as "Sefirat Ha'Omer". The day of Lag Baomer is celebrated on the 33rd day of the count, namely the 18th day of the Hebrew month, Iyar.