I also saw April Wine twice, once in July, 1977 at La Ronde on Ile Notre-Dame in Montreal, with Andy Gibb opening, and again in May, 1980 with Johnny Winter. I missed most of April Wine's set at the 1980 show because it was a really hot day, I was really high, and I didn't eat anything. I went out into the concession area, where it was cooler, and I fainted. They brought me in a room, and wouldn't let me out until after the show was over. I could hear it OK.
Andy Gibb was the youngest brother of The Bee Gees. He was 19 years old when I saw him, and he'd already had a Billboard #1 song, but he became a cocaine addict, and was dead by age 30.
For the 1980 show, we had been driving in to Montreal from Sherbrooke, and when we drove by one car with some young people in it, one of my friends quickly made a hand drawn sign that said "April Wine", and those guys beckoned us to pull over to the shoulder, and they shared their very potent weed with us. That's what it was like in Quebec at that time.
The last time I smoked hashish at a concert was Television at The Danforth Music Hall in 1992. People around us looked at us a bit funny, but didn't say anything. In a concert at The Montreal Forum in the 70's, at least 20 lighters were lit somewhere in the crowd, at any given time. It was probably like that at Maple Leaf Gardens, too, but things were always more permissive in Quebec back then.