PS - I think the 1975 Slims circuit was the first time all the events were played indoors. Prior to '75, the circuit was somewhat split and played throughout the year. They consolidated it into an indoor circuit beginning in 1975.
That's correct Dennis. The Slims (and later Avon) circuit was totally indoors on carpet from 1975-1982. Many of the events were natinanally televised in 1975 and 1976.