For the members of a wedding party, the obligations go well beyond the event itself. There are pre-wedding celebrations, from the engagement party to the shower to cake tastings, and destination bachelor/bachelorette parties are increasingly in vogue -- not to mention a trend toward post-wedding festivities. While the nonstop events add up to lots more fun, they also add up to lots more expense. A survey by American Express found that the average expected outlay for members of a wedding party is $743 in 2016 and even higher for millennials -- $928. The money goes to necessities including travel and clothing for the big day. Before resolving to say no to the honor of being in a wedding party, relax. Bridesmaids and groomsmen can keep costs under control with a touch of effort and advance planning.