Annual passholder previews for May 2-5 have already sold out.
Select rides will be open 6 p.m. to 8 p.m. on Jan. 8 and 9 exclusively for pass members and Fun Card holders.
Disneyland's theme parks have been closed since mid-March with no reopening in sight.
The Sesame Street Birthday Party Celebration will run on Nov. 9 and 10, featuring a special never-before-seen parade float and free mini-cupcakes for guests.
New offerings this year include a Sesame Street Christmas parade and a character meal with Santa Claus.
SeaWorld Entertainment CEO Gus Antorcha talked rising attendance and competition from other parks on the company's quarterly earnings call, but didn't discuss recent layoffs or departures of top executives.
The removal of Sesame Street's Count-Around Playground was "not related to safety," according to SeaWorld. It will be replaced by a new play area and additional seating for the nearby food trucks.