Doors will open at 8 a.m. Saturday for Red Sox Fenway Fest, which takes place at Fenway Park, the MGM Music Hall and the House of Blues Boston.

Offseason trade additions Sonny Gray (starting pitcher), Johan Oviedo (starting pitcher), Tristan Gray (utility infielder), Jake Bennett (starting pitching prospect), Tyler Samaniego (pitching prospect/reliever) and Ryan Watson (Rule 5 reliever) will attend.

Roman Anthony, Trevor Story and Aroldis Chapman headline the list of players who are scheduled to be there.

The Red Sox announced the event is already sold out.

Activities throughout the day:

9 a.m.: A welcome event and team introductions.

10 a.m.: Ballpark activations throughout Fenway Park open.

10:30 a.m.: Autograph sessions at the House of Blues Boston and inside the visitors clubhouse. Additional autograph locations opening at 11:00 a.m. in the Dell Technologies Club and the Team Store on Jersey Street.

11 a.m.: A panel of Red Sox pitchers discussing pitching.

12:30 p.m.: A panel on defense and run prevention.

2 p.m.: A kids press conference. Young fans can ask Red Sox players questions.

3:30 p.m. — A panel with members of the 1986 AL champion Red Sox featuring Wade Boggs, Dwight Evans, Jim Rice, and Bob Stanley.

Players, others scheduled to attend

Players scheduled to attend: Wilyer Abreu, Roman Anthony, Brayan Bello, Kristian Campbell, Triston Casas, Aroldis Chapman, Kutter Crawford, Connelly Early, Nate Eaton, Romy Gonzalez, Sonny Gray, Tristan Gray, Kyle Harrison, Tanner Houck, Zack Kelly, Marcelo Mayer, Jovani Morán, Carlos Narváez, Johan Oviedo, Ceddanne Rafaela, David Sandlin, Justin Slaten, Nick Sogard, Trevor Story, Payton Tolle, Greg Weissert, Garrett Whitlock, Connor Wong.

Prospects scheduled to attend: Franklin Arias, Jake Bennett, Shane Drohan, Mikey Romero, Tyler Samaniego, Tyler Uberstine, Ryan Watson.

Alumni scheduled to attend: Wade Boggs, Dennis Eckersley, Dwight Evans, Carlton Fisk, Jonny Gomes, Brock Holt, Lou Merloni, Jim Rice, Bob Stanley.

Coaches scheduled to attend: Alex Cora, Andrew Bailey, Peter Fatse, José Flores, Chris Holt, Kyle Hudson, Dillon Lawson, John Soteropulos, Jason Varitek.