The Massachusetts Bar Association said it will honor lawyers and law firms for providing free legal services to the public at a ceremony next month.

The association added that it will bestow its Lifetime Achievement Award posthumously to Nancy King, the former executive director of South Middlesex Legal Services who died in December.

The luncheon ceremony is scheduled for March 6th at the John F. Kennedy Presidential Library & Museum in Dorchester, and state Representative Byron Rushing, a Boston Democrat, has agreed to deliver the keynote address, the association said.