The Council on Aging invites Carlisle seniors to its monthly luncheon, scheduled for Friday at 11:45 a.m. at the First Religious Society, 27 School St. Reservations must be made by noon Monday; call 978-371-2895. Before the meal, there will be a free blood-pressure screening clinic from 11 to 11:45 a.m., sponsored by the Friends of the COA and Emerson Hospital Home Care. After lunch, Greg Curtis will sing standards, Broadway numbers, and patriotic songs. The suggested donation is $3.