Let me try to explain things. There are lots of threads on past events, but here's the event in a nutshell:
You, and a team member pay a registration fee to sign up for the Hunt. It's one fee per team and each team can only have two people. (Only one team member needs to be a member of Visions Fantastic). Your payment is done thru Paypal and is non-refundable after a certain deadline specified in the event information. You will choose a team name and submit contact information in case we need to get in contact with you.
You meet at Disneyland in the Picnic Area (entry plaza) at 8:00AM the morning of September 10, 2011.
Your registration fee does not include park admission, parking, food or drinks.
Teams are checked in and you're assigned a team number.
You get instructions for the day's events. For Part One, starting a 9AM, you'll get a booklet showing cropped and close-up photos of a detail in Disneyland park. Your task is to find the object and take a photo of it. There is also a category of "list items" where you must find the object listed (sometimes there can be more than one right answer).
At lunchtime, you'll turn in your camera's memory card, take a quick break and proceed to PART 2 (where you typically won't use your camera again). The activities in Part 2 range from question and answer, to questions about a particular detail in Disneyland, and even taking you on certain attractions and answering questions about them. While this is going on, Judges are checking your photos and tallying scores from Part 1.
At the end, you meet up back the Picnic Area (usually around 5:00), scores from part 2 are tallied and winners announced (usually around 6:00).
After the event, you will get your memory card back (it will be erased to prevent the game from being replicated).
It's a tremendously fun event - you will notice details you never knew existed and appreciate the level of detail in the park. It's not really based on 'trivia', so doing research before the event won't help. It takes attention to detail, being able to spot objects, endurance (walking the park several times over), and careful planning - the teams that ultimately win are the teams that sit down with the booklet and plan a strategy.
Hope that helps!