First, determine that number of participants you need. If you need more groomsmen, perhaps use a family member or good mutual friend to add to his side to balance it out. If that doesn't work, try reassigning them a task as head greeter, hostess at the reception, bachelorette party planner, or something else to make them feel important, special and a part of your big day. Worst case scenario, you may have a few ladies parading down the aisle alone. And in all honesty, more and more weddings are seeing this trend. Us women have a lot of friends!! We will call it a modern trend and roll with it!