S.C.J. FAQ: Section 5.1. Jewish Holidays: What are the different holidays?
http://www.shamash.org/lists/scj-faq/HTML/faq/05-01.html
«Lag Ba'Omer (Iyar 18--The 33rd day of the Omer)
Thirty-third day of Omer counting, as indicated by the numerical equivalent of the Hebrew letters lamed (30) and gimmel (3), hence the word lag. . Lag Ba'Omer takes place during the Sefirah. During this day there was a break in the Hadrianic persecution. Weddings and joyful occasions are permitted.
Lag Ba'Omer is considered a joyous day on which the semi-mourning observed during the seven-week Omer period is suspended. It is commemorated as the day of the cessation of the plague in which 24,000 disciples of Rabbi Akiba were said to have died during the Bar Kokhba revolt (TB. Yev. 62b). It also marks the yahrzeit of Rabbi Simeon bar Yohai. Lag ba-Omer has been traditionally celebrated with the lighting of bonfires on the eve and during the day, and with hiking excursions in the countryside. Sporting events and games with bows and arrows are held, as a symbolic remembrance of the Bar Kokhba revolt and the physical prowess and courage required of his soldiers. In Israel, it is customary to light bonfires at the tombs of Simeon bar Yohai and his son Eliezer at Meron, near Safed, and at the tomb of Simeon the Just in Jerusalem. Throngs congregate to sing and dance, and to honor the memories of Simeon bar Yohai and Rabbi Akiba, who were among the main rabbinic supporters of anti-Roman resistance
==> In hasidic circles, three-year-old boys are traditionally given their first haircut at these festivals. <== Older Torah students and adults celebrate the day as the "Scholars' Holiday". Lag ba-Omer is also a traditional day for wedding ceremonies to be held because of the general halakhic injunction against weddings during the period of the Omer counting.»
Full Disclosure I myself am a Misnaged/Mithnaged an Opponent of Hassidism As such I belong to a group that either opposes Mysticism/Kabbalah entirely, or at least any public manifestations thereof. *(See below)
Even granting solid Kabbalistic reasons, the public nature of "Odd Customs" leaves onlookers with a negative impression of Jewish Ritual
The reality is that since they have gone public, the best antidote is education and information. Since I'm not well-versed in Kabbalistic Ritual I solicited help from some colleagues
Perhaps The single best article may be found here
http://www.aish.com/h/o/33o/91684314.html
The
aish.com site has other articles in the same vein.
For me the bottom line is that Kabbalah and Esoteric Judaism ought to be private. But once it has gone public we need to seek the best possible rationales we can in order to understand what's going on.
As far as practicing these for oneself, it's a matter of taste. As far as Jewish Halachah goes these are optional; and so if they enhance one's connection to the Eternal then go for it! If they turn you off, shun it.
So while I DEIGN not to practice some these ritualls myself, I try not to DISDAIN those who do! <Smile>
*Some people were a little startled when reading the fourth paragraph so here is some background I count myself as a Yecke, and while 19th century German gedolim had widely divergent attitudes regarding Kabbalah, ranging from those who dismissed or abstained alltogeher from engaging in kabbalah, to those who were themselves great kabbalists. However, there was an almost unanimous agreement that mystical teachings and practices were not for public consumption and should not be incorporated as popular practices.