Sue Pfister addressing the Representative Town Meeting last December just prior to her retirement.

WESTPORT — A tree will be planted Monday at the Westport Center for Senior Activities in tribute to Sue Pfister, the center’s longtime director who retired at the end of last year.

An 8:30 a.m. ceremony will mark the tree planting on the center’s front lawn at 21 Imperial Ave. The event is organized by the Friends of the Westport Center for Senior Activities.

Pfister spent her 35-year career working for the town’s Department of Human Services. Over that time, she helped to foster development of the senior center as it was shuttled between several venues.

In 2004, she helped to oversee construction of the existing senior center at 21 Imperial Ave., as well as expansion of the facilities in 2016. Among the variety of programs offered at the center, which range from fitness and crafts programs to movies, speakers and social gatherings, the weekday congregate meal program — served in Sue’s Café, named in tribute to Pfister — is cited by many as one of its key offerings.