I had a convention at the Gaylord recently. Convention Ticket Services offerend an after 2 Epcot ticket you could buy there. It was ONLY good for Epcot and not exactly cheap (maybe $10 off regular admission?) However, I think they sell this at jsut about ALL convention hotels My organization had a link to the ticket stuff on thier website and we had the same type of deal several years ago at the Marriott.
(And Disney does enforce the 2 pm part pretty strictly, one guy at the convention thougth he would join his wife at 1:30 for lunch figureing "they will let me in a few minutes early" Nope, the ticket wouldn't work untl 2)