Literally the "happiness of the Torah," Simchat Torah marks the completion of the annual cycle of the Torah reading. Jews dance around the synagogue with the Torahs, even the Torahs with the ratty looking covers. On Simchat Torah children actively participate in the service, first in the dancing and then in a special component called Kol HaNe'arim, when all the children say the blessings over the Torah together under a tallit. How they all fit under there is one of those "God stretches the land to fit all the Jews" deals.
