I found this article on CNN regarding the fact that there are no hard-and-fast rules for weddings like there used to be for your grandmothers.
http://www.cnn.com/2013/10/04/living/matrimony-martha-wedding-rules/index.html
This picture is from one of my all time favorite weddings, small but very memorable. One of the unique choices of the couple was the kazoo music that was for the wedding procession!