The books 'Ten Imaginary Years' and 'A Visual Documentary' both report that the concert on 5 June 1980 at Lyon University was cancelled after the band got lost in the mountains on their way to the venue.
However, since the concerts in Vaulx-en-Velin (near Lyon) on 4 June 1980 and in Paris on 5 June 1980 both took place, it is more likely that the date given in the books is incorrect and that the story about the cancelled concert in Lyon took place in 1979, when the concert in Vaulx-en-Velin (near Lyon) on 19 December 1979 was cancelled.