The Hartstone Inn, 41 Elm St., Camden, will support the Camden Public Library during National Library week by donating 50 percent of the proceeds of each meal on three different evenings. This Dine for a Cause offer will be available March 31, April 7 and April 11, from 5:30 to 8:00 p.m. Reservations should be made at 236-4259. Diners should mention the library when booking their reservation.