The note can be found at the Top of the World, just outside the room with the dead settlers on the mezzanine level.
Why are you making my life so difficult? I am an artist and if the canvas I use is sullied or unsuitable, how do you expect me to create my stunning crystalline works of art? I need the gallery to be colder. I don't care if the patrons wear coats, it's the only way my ice sculptures will remain in one piece!