Head coach Sean McVay and the Rams players, clad in blue warm-up gear, were cheered as they took the stage at L.A. Stadium & Entertainment District at Hollywood Park.
They were preceded by Inglewood Mayor James T. Butts and actor Danny Trejo, who reminisced about sneaking into L.A. Rams games as a boy in the 1950s.
The new Inglewood venue is scheduled to serve as the Rams' and Chargers' home field in 2020.
Sunday's free-admission rally included giveaways, food trucks, merchandise sales and other fan activities.
After the Rams departed the event in the team's bus caravan, they boarded a flight to Atlanta for the final days of Super Bowl preparation.