Make arrangements for the bachelor party.
Keep a list of directions and phone numbers of everyone in the wedding party.
Help pick out tuxedos and make sure ushers know when/where to get fitted.
Get all the ushers together for the rehearsal.
Assist in the groom getting dressed.
Make sure the groom has the marriage license with him.
KEEP TRACK OF THE RING.
Make sure groom and ushers are at the church ½ hour before the ceremony.
Witness the wedding certificate.
Discuss all fees & tips with groom and hold them in envelopes in your pocket.
Know when and where the pictures are being taken and gather everyone.
GIVE A MEMORABLE SPEECH.
Read correspondence from any guest that could not make it to the reception.
Dance with: bride, bride/grooms mothers and any member of the bridal party.
Coordinate the tossing of the garter and the bouquet.
Make it easy for the bride and groom to make their exit.
Offer your help whenever you deem necessary.