Last year I believe an official announcement was made some time in April, but because of my computer crash I no longer have the original email(s). The official registration form was released on May 15th. The deadline for "early bird" registration was June 15th, although that was extended, no doubt due to poor response.
Early Bird registration for the full four days was $375, and $475 thereafter. Single Day Passes were $135, and then $155 after the deadline. It's impossible to guess if that will remain the same.
For your information, master classes with Lydia Kavina were offered for $65, and $85 after the deadline. Private lessons with Lydia were available for $35 per half-hour, and $45 per half-hour after the deadline.
Rooms were offered to event participants at a "discount" at the Doubletree hotel for $130 per night. Personally, I had to opt for a room at the Day's Inn.
Obviously, we do not yet know what the fees will be for 2006 or who the performers will be. I don't know if the performers must pay the fees but the rest of us do. You're only a "performer" if you've been contacted by Moog Music and have been asked to be one, although there was an open mic night where anyone could get up on stage and play for up to 10 minutes. I imagine there will be a composition contest again this year.