What are the lesser known Jewish holidays?

Most people know the Jewish holidays of Rosh Hashana, Yom Kippur, and Chanukah. Some of the lesser known Jewish holidays include the following: Sukkot, Shemini Atzeres, Simchat Torah, Tu B'Shvat, Purim, Passover (Pesach), Lag B'Omer, and Shavuot.