Google is notorious for caring nothing about what customers want. Every single person who uses Flairs should send Feedback multiple times
from the Settings button on their calendar page telling Google they want the right column back to accommodate gadgets, and especially, Flairs. Grumbling here doesn't get Google to listen. If we all send repeated feedback at least they will know how unhappy people are. Might as well make their lives as miserable as possible over this.
Maybe Sebastian will find a way to create Flairs as a link to the calendar which will then allow us to add icons. There are probably enough people who code who can help if he will allow it.