The princess took off her earrings to show that she was going to donate them to the fundraiser. That’s something she would normally never do since she doesn’t actually care about the cause, she just wanted to make a big statement and bring back some of the attention to her. As for why the ML never left the carriage, I think it’s because he saw the event was already ruined, so he didn’t need to step in after all (but that’s my guess).
I thought he left early to purposely bring his carriage past Princess B**** party in the direction of his engagement party to show all the nobles that YES, there was indeed another party going on that was way more important than her party. I can’t remember how, but I thought evil princess purposely threw her party on the same day and had her gossip mill convince the nobles that the other party was just rumors. I might have to re-read the last 5 or so chapters.
so the start was confusing for me idk what happened like didnt the ml go to the evil princess's party? but hes still in the carriage? what was he trying to do by going there? and the evil princess's speech after the ml's scene, what does she mean by saying all those (she even took off her earrings which i also dont really get)? as for the 2nd part about the uncle ive already read explanations and understood it