There are all sorts of small tasks I've done for the bride when I was a bridesmaid and/or maid of honor in their wedding. Co-hosting a shower with the mothers, running the games during the shower, making a gift list for the bride while she opened presents, planning a bachelorette party with the help of the other bridesmaids, helping her get ready on her wedding day, etc.

I considered it an honor to be asked to be a part of my friend's weddings and was happy to help when I could. If I hadn't done those things, somebody else would have had to step forward. Asking your friends/relatives to help seems like the obvious choice to me.