The retirement of a treasured postal carrier is an event worth celebrating, decided the patrons of Lois J. Overton Wortham, so they got together on the shared driveway between Amy Cohen and Anne Holland’s houses on Summit Avenue Saturday to do so. Lois is calling it quits after 15 years. Thanks to contributions from 67 neighbors they were about to gift Lois funds for her long-delayed dream of art classes at RISD.