The Commission will choose between three proposed facilities that could have up to 1,250 slot machines, but no table games.
The bidders are Penn National Gaming, which hopes to operate a slots parlor at the Plainridge harness race track in Plainville; Raynham Park, a former dog-racing track; and Cordish Cos., which has proposed building a slots parlor in Leominster.
Commissioners are using several main criteria to evaluate the proposals, including economic development, finances and site design.