The culmination of Sukkot and Shemini Atzeret. Final Parsha from Deuteronomy is read in synagogue. Everyone called to the Torah reading. Conclusion of the annual Torah reading cycle.
Simchat Torah or Simḥath Torah (also Simkhes Toreh, Hebrew: שִׂמְחַת תורָה, lit., "Rejoicing with/of the Torah,") is a celebration marking the conclusion of the annual cycle of public Torah readings, and the beginning of a new cycle. Simchat Torah is a component of the Biblical Jewish holiday of Shemini Atzeret ("Eighth Day of Assembly"), which follows immediately after the festival of Sukkot in the month of Tishrei (mid-September to early October on the Gregorian calendar).
(... from Wikipedia on 2012-04-17 06:21:20)