The details come from a Marvel signing schedule.
Marvel released details that also mention the Guardians of the Galaxy will be signing.
Friday July 25th
Guardians of the Galaxy: Michael Rooker 4pm-5pm PST
Saturday, July 26th
Ant-Man: 12pm -1pm PST
The Avengers: Age Of Ultron: 3:45pm-4:45pm PST
It's currently uknown which members of the cast of Ant-Man and The Avengers 2 will be signining for fans.
No specific details for Marvel Studios' Hall H plans have been made known, but with the cast of three of the movies attending signings, you can bet something big is on the slate for Saturday night.
"The Avengers: Age Of Ultron" hits May 1, 2015 directed by Joss Whedon starring Robert Downey Jr., Chris Evans, Chris Hemsworth, Scarlett Johansson, Mark Ruffalo, Jeremy Renner, Samuel L. Jackson, Elizabeth Olsen as Scarlet Witch, Aaron Taylor-Johnson as Quicksilver, Paul Bettany as Vision, with James Spader as Ultron.
Head on over to the Cosmic Book News Avengers movie hub for more.