Hi ramgirl
As already mentioned, it may be wise to get a few people involved in organizing the event.
Give everyone a task and keep checking on them regularly to make sure they get the job done.
If progress is slow, add someone else to help out.
A few things I can think of:
location, parking, food/drinks (if any), toilet/washroom availability, ticket sales & prize table organizers, fish verification & recording,
how to get the word out (friends, relatives, marketing/advertising), contest rules & regs, municipal requirements (by-laws, permits, etc.)
cheers
Remo