Wedding receptions can be held after the wedding especially in the case of the couple either choosing to elope at the last minute or if the couple had a destination wedding that not all their guests...
There is the bridal showers; bachelor party for the groom to be and a bachelorette party for the bride to be. There is generally a Wedding Rehearsal a few days before the wedding and a dinner party...
Sometimes the best man will do this honor ... at other times, the groom. There is not real written rule for this ... just let it happen, and enjoy the moment without everything being "planned" or...