To run an event you need to be organized and think ahead to see any problems that may happen in. A great way to get organized is to keep check of everything with lists. I have lists for just about everything especially at the early stages of planning and in those final weeks. It is of the utmost importance that nothing is over looked. For a great starting point, have a look at the link below for a comprehensive checklist that you can use or alter to suit your need.

http://www.sua.umn.edu/groups/forms/event_planning.pdf