I love the calendar markers / anniversary setting for the timeline - being able to see specific reoccurring events helps me not ignore/forget something important that the character in a story would obviously know as it is their world.
But they can get so crowded it’s hard to discern what’s being seen (pinning two hundred birthdays for an epic fantasy makes it almost pointless as just about every day has a marker.) And you can’t really see if two separate things happen on the same day (a holiday and someone’s birthday). Maybe there could be a ‘this day is also (Full Moon, Tom’s 63rd birthday, the 4th day of Harvest Festival)’ section in the Item Inspector? Or just one marker that when you hover over it tells you everything that’s happening on that specific day, instead of each marker denoting one thing?