We have word from the Marriott that the Jamboree block has been filled for Thursday only. Rooms may be available at a non-discounted rate - ask the reservation clerk.
Marriott rooms are still available at the discounted Jamboree rate for Friday through Sunday. But don't dawdle if you haven't made your reservations yet. The contract with the Marriott states that the room discount expires on May 9.
Remember that Jamboree offers a roommate service to help minimize cost and help you stay conveniently close by. If you are interested in being added to our roommate list, send an email to firstname.lastname@example.org and put "Roommate Wanted" in the subject line.