I think part of the problem could be choice of venue. I really don't think they wanted to deal with Harold Ballard (owner of Maple Leaf Gardens) after the 71 show. Pal Hal was a shifty character. They certainly could have found an outdoors venue for the 73 tour given it ran from May through July. The 75 tour would be a no go. As for 77 I have no idea where they intended to play as there most likely wasn't an big enough arena or indoor venue. If they actually had rescheduled it maybe at Exhibition Stadium. Who knows?