As someone who grew up in this area at this time period, I can tell you that Lake Forest doesn't have much of a sense of community of it's own separate from the Chicago metropolitan area. North Chicago suburbs tend to sound like small communities on paper, but it's impossible to tell when one ends and another begins, so they all sort of bleed together into a single mega-suburb.

I think it was just normal to put such announcements in the newspaper at this time and this is the format of how it was done.