The school's slogan was "Palma Per Ardua": "Success through Hard Work".

In an effort to accommodate the students, Gordon Graydon's vocational and autism spectrum disorder (ASD) programs were relocated to Glenforest Secondary School for 2018-2019 school year.

In addition, Graydon's graphic design and international business programs (GDM/IBT) were moved to T.L.

Kennedy and Glenforest secondary schools were needed to accommodate the incoming students.

In December 2020 the Mississauga Continuing and Adult Education Centre moved into the former Gordon Graydon Memorial Secondary School building.