Lag B’Omer is the thirty-third day during the “counting the omer” — a custom originating in ancient Israel that begins on the second day of Passover and ends with the holiday of Shavuot 49 days later. Rabbinic tradition dictates that this seven-week period is a time of mourning, and only on Lag B’Omer are the prohibitions that accompany the mourning period temporarily lifted.
If Humanistic Jews observe Lag B’Omer, it is as a celebration of spring. Akin to the joyous bonfire dancing celebrations in Israel, Humanistic Judaism celebrations can include picnics, bonfires, dancing or planting events.
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