Groomsmen:
Pays for their own wedding attire
Attends rehearsal and rehearsal dinner
Attends bachelor dinner if there is one
Escorts bridesmaids during the ceremony
Ushers:
Pay for own wedding attire
Make sure principles have flowers before being seated (unless this task is assigned to another).
Distribute wedding programs (unless this task is assigned to another).
Seat guests on appropriate side of church.
Assist elderly guests to seats.
After all guests are seated, unroll aisle carpet.
Check church or synagogue for any items left behind.
The number of ushers is usually determined by the size of the wedding. One usher can comfortably seat about fifty guests.
Ushers are usually brothers, relatives or best friends of the groom. In inviting people to serve as ushers, make sure that they are aware of the expenses involved.
While it is not necessary to have an equal number if ushers and bridesmaids, it does balance nicely if they walk in pairs in either the processional or recessional.
Groomsmen usually help the best man plan the bachelor party for the groom.
Groomsmen attend pre-wedding parties.
Groomsmen attend the rehearsal and the rehearsal dinner.
The main Job of the usher is to seat guests. They should arrive at the ceremony site at least one hour in advance and should have clear instructions on the seating plan. In Christian Ceremonies, the bride's family and guest sit on the left and the groom's on the right. In Jewish services, the seating is opposite, with the bride's family on the right. Female guests are escorted by having the usher offer his right arm to her. Her date or spouse walks behind. Male guests are lead to their seats. If there are pew cards being used or a special reserved section, ushers should pay special attention as they escort these guests to their seats.