Some convention groups are offered reduced price Disney park admission, exactly what is offered may vary. An "after 2 PM" ticket is often available although the price compared with a regular admission was not that much reduced. Unlike regular admission tickets, most of these promotional tickets have expiration dates.

Particularly with early morning business the next day, you need to budget your time. If it is a busy night at the Magic Kingdom, it can take an hour to exit the parking lot (a ferryboat or monorail ride is required also) at park closing time and also an hour to board a bus (from any park on a busy night) if you used Disney transportation.

Disney hints:
http://members.aol.com/ajaynejr/disney.htm