A few newbie RawTherapee color questions...

The toolbar at the bottom of your screen is for your display profile which you will only obtain after calibrating your screen. You haven’t done so, so leave this at “None” for now. The BayPhoto ICC profile is a soft proofing profile (probably), which can be used to check how your photo’s would look like when they are printed on their printers. In all cases, without a properly calibrated monitor, you’re going to have a difficult time making accurate predictions on how your calendar is going to look like.