Groomsmen is a group of men that usually includes brothers or friends of the groom. These men work closely with the groom and his best man. It is a great honour to be a groomsman, and the groomsmen are required to perform their duties.
Groomsmen need to make themselves available for important tasks, such as getting fitted for their formal wear. They get to attend the bachelor party, and they are expected to help with the party and wedding preparations.

Groomsmen are also needed as moral support for the groom. They will assist the groom throughout the preparation and ceremony, and keep everything going on smoothly. On the big day itself, groomsmen may also act as ushers. They may help escort the bride and groom’s mothers, and also usher guests to their seats. They may also escort bridesmaids down the aisle.
The groomsmen need to attend all reh