Lag Means 33 and B'Omer is of the Omer
In Hebrew, each of the 22 letters represents a number -- the first ten letters are 1-10 -- then comes 20-100 by 10s and then 200, 300, 400. In order to write numbers, letters are used. The Holidays Tu Bishvat (the fifteenth of Shvat) and Lag B'Omer (the 33rd day of the Omer) use this method of numeration.
The Omer was mentioned in the Tora (Jewish Bible; Pentateuch) and was a barley sacrifice that was brought on the second day of Pesah (Passover) but it also refers to the period between Pesah and Shavuot (the Feast of Weeks which commemorates the giving of the Tora). The Omer period is 49 days long -- Lag B'Omer is the 33rd day.
The Omer was mentioned in the Tora (Jewish Bible; Pentateuch) and was a barley sacrifice that was brought on the second day of Pesah (Passover) but it also refers to the period between Pesah and Shavuot (the Feast of Weeks which commemorates the giving of the Tora). The Omer period is 49 days long -- Lag B'Omer is the 33rd day.
All About the Omer.....
Barley Offering and Counting the Days
The Omer offering marked the first day of the Counting of the Omer -- the 49 days between Pesah and Shavuot (The Feast of Weeks). This period is also called Sephira -- literally the counting.
During the 1st and 2nd Centuries of the Common Era, a Talmudic Rabbi named Rabbi Akiva had 24,000 students who began dying, While there are varying stories of how they died (one theory was they died from a plague when they failed to respect each other), the more likely explanation is that they were killed as part of the Bar Kokhba Rebellion (against the Romans). The students began dying during the Omerbut, according to legend, the dying ceased on Lag B'Omer.
Another explanation for the revelry of the day is that it is the anniversary of the death of Rabbi Shimon Bar Yochai(Rabbi Simon the son of Yochai) -- the reason being that the esteemed Rabbi had told his students to celebrate on that day.
Today, many Jews celebrate this day with picnics and bonfires.
More About Lag B'Omer on the Chabad Site
The Princess Who Wanted to be Beautiful
The Gold Star
Reading this book gives a child a view into the mind of a child whose only thought is how can he help. Reading about Tzedaka (Charity) and Gemilot Hesed (acts of kindness) helps teach a young child that helping others is a good trait and something (s)he should strive for.