Beginning in the 1960s, a number of well-known musicians played at student-organized concerts in McDonough Gym, including Ray Charles (1963), Peter, Paul & Mary (1964), the Kingston Trio (1965), Johnny Mathis (1966), The Lovin’ Spoonful (1967), the Four Tops (1968), The Who (Homecoming 1969), the Grateful Dead (Homecoming 1970), and Traffic (November 1970). After incidents at the Grateful Dead concert and the Traffic concert (which was attended by 6000 people, 2000 more than fire regulations permitted), the University administration suspended concerts on campus.