Calendar colours are inscrutable.
It's even more difficult for me because I'm colour blind. This feature request would provide colours for people with CVD that are readily distinguishable with common colour names. CVD-friendly palettes and reference material are available. c.f. https://sashamaps.net/resources/20-colors/
What colour, really, is "Fern" or "Olive" or "Pickle" and how do they differ? Do I describe it to a friend as "green" or "yellow" or "brown" or WHAT? FWIW - Plum, Enzian, and Cobalt look identical; Slateblue, Purple, Pink are the same; Cerise = Soil; Carrot, Forest, Pickle identical; Pine = Saraha; Reef is unique. Out of 20 colours, only five are usable for me, and there is no way I"m going to be able to tell a friend "It's the carrot-coloured calendar."