This is a great color photo of the exterior of Wrigley Field and the famous marquee, which was (generally) painted that aqua-blue color until 1965, when it became its now-iconic red.
Given the dress of the people in the photo and the team shown as the Cubs’ opponent, it wasn’t too hard to pin down the date — or at least the date range, because since there are three dates listed, it’s impossible to know which day this was taken. That’s not going to stop me from taking an educated guess, though.
The Cubs and then-New York Giants played these three games on June 22-23-24, 1951.