Just to clarify, I haven’t treated events in any special way. I should have read your original post on this more closely. So events are included with everthing else in the /yyyy/yyyy-mm/yyyy-mm-dd/ folder structure I use. You can do it the way you’re proposing, but I wonder if this is really necessary?
Plex has an Album feature which allows you to group images related to events (usually over consecutive days) or topics of interest (not necessarily over consecutive days; could even span years). I believe this is a much more flexible approach to tagging images with a common theme. Here’s an example:
The only issue I have with Albums is that there is an outstanding bug that prevents videos being included easily in Albums. There are workarounds. Refer to Plex Photos - Issue with Videos and Albums .