Rooms at the reduced rate at the Marriott are sold out. We are working to add rooms to the block. If/when they become available, they will appear on the room reservation page.
As an alternative, there are two hotels within easy walking distance (~ one block) of the Marriott: the Courtyard Oakland Downtown https://www.marriott.com/hotels/travel/oakcd-courtyard-oakland-downtown/ and the Washington Inn http://www.thewashingtoninn.com/ . We do not have room blocks at either hotel, so we suggest booking early to lock in the most favorable rates.