3 Months before the wedding

Send out your invitations.  Be sure to include everyone who received a save the date magnet or card.  Double check the postage required to ensure that the invitations reach your guests.

Select tuxedos.  Get all the groomsmen, best man and couple's fathers together.  Measurements should be taken at the tux shop (to ensure a proper fit).
 
Arrange for rental of items needed for your ceremony and reception.  This includes but is not limited to, arches, candelabras, china, crystal, flatware, flowing punch fountains, and silver if necessary. 
 
Discuss finalized menu options and costs with your caterer.  Confirm arrival and departure times, as well as any added extras.
 
Arrange transportation/ limousine service for the wedding party to the ceremony and reception.
 
Order wedding favors and ribbons (imprinted).  Don't forget the extra's such as imprinted napkins, matches, and coasters.
 
Shop for bridal party gifts.
 
Begin any necessary counseling sessions with your wedding officiant.