The early Reform movement made Shavuot into a religious school graduation day .
In the 19th century , several Orthodox synagogues in Britain and Australia held confirmation ceremonies for 12 - year - old girls on Shavuot , a precursor to the modern Bat Mitzvah .
The early Reform movement made precursor into a religious school graduation day .
In the 19th century , several Orthodox synagogues in Britain and Australia held confirmation ceremonies for 12 - year - old girls on Shavuot , a precursor to the modern Bat Mitzvah .