Groomsmen
How to Choose
Here, too, you want people you're comfortable with. A brother (or brothers) of the bride makes a wonderful addition.

What Do They Do?
Groomsmen might help host prenuptial celebrations -- the bachelor party in particular. They pay for their own formal attire. At the wedding, groomsmen often serve as ushers (as do bridesmaids, in some cases); if so, they need to pay close attention at the rehearsal and arrive early to roll out the runner, distribute programs, and escort guests to their seats. They walk in the procession alongside the bridesmaids and stand next to the best man during the ceremony.

You can also ask groomsmen to make themselves available to guests after the ceremony, for help with directions to the reception site. Some couples have ushers in addition to groomsmen. Either way, make sure you have enough help on hand. A good ratio is one usher or attendant for every 25 guests.

Etiquette Tip
Select personal gifts for your groomsmen, including something extra special for your best man, to give at the rehearsal dinner. These are often small luxury items, such as cuff links, leather-bound journals, or money clips; gift certificates are also a good choice.