A group of former classmates from Chatham Collegiate Institute are reuniting for the 45th anniversary of their high school graduation. A group of former classmates from Chatham Collegiate Institute are reuniting for the 45th anniversary of their high school graduation. The class of 1981 will meet at Sons of Kent in Chatham on Friday from 7 p.m. to 10 p.m.We apologize, but this video has failed to load. Article content“We’re a very tight-knit class and we usually get together,” Allyson Morris, one of the students, said. Along with the Sons of Kent event, the group will meet for lunch at one of the classmates’ farms and for dinner at a restaurant in Chatham.