Billboard change over is a very useful & interesting topic.
I have not looked at my database of photos just yet, but if that one photo is from Opening Day it's possible that particular billboard ad (Life Buoy Soap) has not been changed over yet from the previous year---meaning that particular ad (Life Buoy Soap) is from the 1919 season vs. what you would normally see in that spot for the 1920 season.
If the year, stats etc.. are correct and that Life Buoy Soap billboard is from the 1919 season & there was only one Billboard change over (to WaJo estate photo)...then it might be from July 1st 1920.
Also, I would try zooming in on the scoreboard as well from the Wajo estate photo.
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