The Jewish calendar is lunisolar, it follows both the moon and the sun. Gregorian dates shift each year as the two calendars realign. The Hebrew months and their associated holidays remain constant; only the secular dates change.
New Year of the Trees
Feast of Lots, costumes, megillah, hamantaschen
Festival of Freedom, seder, matzah, exodus story
Festival of Weeks, Torah given at Sinai, dairy foods
Day of Mourning, destruction of the Temples
Jewish New Year, shofar, apples and honey
Day of Atonement, holiest day, 25-hour fast
Festival of Tabernacles, sukkah, four species
Completing and restarting the Torah reading cycle
Festival of Lights, 8 nights, menorah, latkes
Jewish-American pride merch for every occasion, memorial day, and moment that matters.