The taxpayer, who was hospitalized and treated as an out-patient for severe depression until March 1973 and then returned to work until 1983, when he stopped work because of his disability, was not grandfathered. Linden J.A. found (p. 6359) that "the 'event' that must occur before 1974 is the actual disability which prevents someone from working at full capacity, resulting in a loss of employment income as a consequence of that disability ... . [T]he reoccurrence of a pre-1974 disability after a period during which the taxpayer was not incapacitated is no different than if the first incapacity appeared after 1974."