Counting the Omer
The days between Passover and Shavuot are considered a time of mourning.
One interruption in this doleful period is Lag B'Omer, the 33rd day of the counting of the omer,which falls on the 18th of the Hebrew month of Iyar. This day is observed as a semi-holiday, and suspends many of the mourning customs up until this point in time.
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