Here's what Mitch Podolak (who invented the Winnipeg Folk Festival) said about Monte on the Maplepost list serve a few minutes ago:

For those who didn't know Monte Dunn, we have just lost a great person and a
not insignicant part of the history of the folk revival in Toronto. I don't
know where Ian and Sylvia found him, New York I suspect but Monte became a
real part of the community. He sure hung around the Bohemian Embassy for a
couple of years. Monte was part of the first year line-up of the Winnipeg
Folk Festival which was 34 years ago for those of you counting. I always
liked him, I'm really sorry to hear this news.
mitch