Bar and Bat Mitzvah to the event. However, this does not delay the onset of rights and responsibilities of being a Jewish adult which comes about strictly by virtue of age. The obligation to lay tefillin begins when a boy reaches bar mitzvah age. The common custom is for the bar mitzvah boy to begin putting on tefillin one to three months before his bar mitzvah. This way, by the time he is obligated in the commandment, he will already know how to fulfill it properly. The first mention of a party associated with a synagogue bar mitzvah was in the 13th century, so
Movement for Reform Judaism boys have their bar mitzvah. Reform Judaism is welcoming to non-Jewish spouses; while the Assembly maintains "clear opposition" to involvement in interfaith unions, since 2012 it allows rabbis to conduct celebratory events as long as the ceremony does not involve clergy or motifs from other religions, or conversely those of a Jewish wedding, like ritual canopy. As of 2017, Reform Judaism has 41 synagogues, of which 39 are located in England and 13 in Greater London. There is one congregation in Cardiff and one in Glasgow. As of 2010, Reform Judasim had 16,125 member households, accounting for 19.4% of synagogue-affiliated