What denominations practice bat mitzvah?

Answer 1

All of them do, so some extent. A girl becomes bat mitzvah as a matter of age, regardless of whether the event is celebrated. Celebrating the bat mitzvah in much the way the bar mitzvah has traditionally been celebrated began in 1922 in the United States. Among liberal Jews (Conservative, Reform, Reconstructionist, Renewal and Humanist) there is now little difference between a bar mitzvah and a bat mitzvah, as the girl is considered just as able to lead part of the service as a boy. On the Modern Orthodox side, the girl will not lead services, but may give a dvar torah at a service (a sermon). On the Hassidic side of things, some families have female-only gatherings where the girl does more than just give a sermon, but not lead any of the elements of the liturgy, since that is for men.