Have you competed before? Do you know the ropes of a competition? If you have, then good.
First, you need to make your concept of your day, events, etc. Pick several days since the venue or delegate might not be able to be present for the competition.
Find your local delegate and contact him/her. You can find the list of delegates
here
Once you plan it out with the delegate (Securing several dates and having your concept approved), go and attempt to book the venue that you are looking for. Note the occupancy limit of the delegate, since you might need to place a limit on how many people can compete.
After you go and book the venue, (SECURE IT FOR SURE.) Make sure you are cleared to charge a registration fee. (Unless you want to have the entire competition be free, which would be pretty cool.)
Once you do that, have the delegate submit the competition to the board so it can get approved. While that is going on, you can set up the website. When you set up the website, make sure you have everything about the venue listed, such as rules, limits, and off-access areas.
When the competition is approved and the website is set up, work on renting out your equipment, and managing your finances. Make sure everything is squared away for the competition.
One major tip is to constantly answer your emails. Don't ignore them if it is a simple question or delay a reply if you really have enough free time.