The Church Meeting Room is on the Our Lady of Sorrows campus, in the church basement. You can enter through the doors closest to the street, or through the doors at the rear (where the elevator is), and go around inside toward the street side of the basement.
RCIA classes for those interested in becoming Catholic are held every Tuesday evening, at 7:00 in the Church Meeting Room at Our Lady of Sorrows, with some exceptions for holidays, and a reduced scheduled during the summer months.