I know it's difficult, but using that example of Chicoutimi, if the anglophones were there at that event, and they were listening to 50% French, they would, through osmosis, pick up some of the French, and vice versa.
Je sais que c'est difficile, mais si je prends l'exemple de Chicoutimi, les anglophones qui participeraient aux célébrations et qui entendraient parler français la moitié du temps apprendraient, par osmose, quelques mots de français et vice versa pour les francophones.