Wedding Duties Checklist

I am trying to find "checklists" or "duties" for the Host Couples for our wedding. I am not totally sure what they are responsible for and I don`t want them doing something that someone else is to do (I want them to have a good time). Just trying to find something to help me keep organized. My wedding is a month away and they actually have asked for something written out so they have an idea and so they don`t have to keep asking.

Any ideas where to find a duties list?