What do people do at bar mitzvah's?

A Bar Mitzvah (or Bat Mitzvah for girls, a term that has arisen in the last half century) is the marker signifying the Jewish boy's transition from boyhood to adulthood at age 13 (or Jewish girl's at age 12). Bar/Bat Mitzvah means Son/Daught of the commandments and as a Bar or Bat Mitzvah, the Jewish child is declared ready to take on the responsibilities of and adult, most notably being able to be called on to read and study the Torah, the scroll containing Jewish Law. In modern days, most B'nei Mitzvot (pl) give a sermon during the Saturday Morning service as soon as possible after his or her Hebrew birthday. It has also because standard to throw a large party at the conclusion of the service.