Minhagim: Sefiras HaOmer

Following the custom of the Ari Hakadosh, the minhag by most chassidim is not to cut one's hair during the entirety of Sefiras HaOmer until Erev Shavuos itself. (This does not include Lag Baomer when one is cutting his son's hair for the first time.) The Rebbe, shlit"a, follows this minhag as well.

It is customary to eat matzah at the seudos on Shabbos between Pesach and Shavuos.

The minhag is not to say Tachanun from Pesach Sheni (Iyar 14) through Iyar 20 which is the week of the sefirah of Hod. (This minhag is mentioned in the name of Rebbe Mordechai of Chernobyl, zy"a, among others.)

Women are exempt from the obligation to count Sefira, but may do so if they wish. If they are certain they won't forget to count any days, they may even count with a berachah. To the best of my knowledge, the Rebbetzin follows the custom of most Chassidim and does not count Sefira.