The Hamilton “Group” was authorized as a sub-section of Toronto American Institute of Electrical Engineers (AIEE) and the Institute of Radio Engineers (IRE) in 1936. In 1944, Hamilton “Group” was elevated to Sub-Section. The AIEE/IRE Hamilton Section was founded 1952-May-07.  It was changed to IEEE Hamilton Section in 1963 when AIEE and IRE merged to form the IEEE. In 1974 the IEEE Niagara Falls International Section split, with Canadian members becoming part of Hamilton Section.
[Note: AIEE and IRE were independent bodies, but old records and probably meetings have been co-mingled.]