Rav Haim Palachi (Turkey, 1788-1869), in his work Mo'ed Le'chol Hai, writes that the name of the month Iyar is an acronym for the names "Abraham," "Yishak," "Yaakob" and "Rahel," and thus alludes to our righteous patriarchs. This is why it is customary to learn Pirkeh Abot during this month, as it is closely associated with the Abot (patriarchs). Rav Haim Palachi adds that it is worthwhile for those who can to visit or to donate to the burial sites of our patriarchs – Me'arat Ha'machpela and Keber Rahel – during the month of Iyar. He further writes that on Pesah Sheni, which is observed on the 14th of Iyar, we omit Tahanunim from the prayer service, and one should conduct some sort of festivity. Those who are blessed with wealth should host a meal on Pesah Sheni for Torah scholars, and some have the practice to eat Masa. On Lag Ba'omer, which is observed on the 18th of Iyar and commemorates the day of the passing of Rabbi Shimon Bar Yohai, it is customary to make a pilgrimage to Rabbi Shimon's gravesite at Meron in Northern Israel. Rav Haim Palachi warns that one must ensure not to engage in frivolity at this occasion, as the opportunity to earn great merit will then be transformed into an occasion of sin. He cites the Midrash's comment that one can earn great blessings in the merit of Rabbi Shimon by participating in this event, but only if it is done the proper way. Rav Haim Palachi adds that it is proper to read on Lag Ba'omer the book Shibheh Rashbi, which tells of the greatness of Rabbi Shimon Bar Yohai, and various famous passages about him from the Zohar. The 28th of Iyar marks the anniversary of the death of the prophet Shemuel, and the Shulhan Aruch (Orah Haim 580) records the custom observed by some people to fast on this day. There is also a custom to pray by Shemuel's gravesite on this day.