Let's say I have created an "event" around Christmas 2018. I select the photos that seem appropriate and create the event. Then, a little later, I find more Christmas photos from 2018. There is a laborious process for adding them to the existing event, in which PSE shows me every photo in my 27,000 photo collection, including those that I have already assigned to Christmas 2018. This requires me to know exactly which photos are already in the existing event. Hmm. So, I avoid that headache and go back to my photos and I "create" another event with exactly the same name. PSE warns me that an event with that name already exists, but does it ask me if I want to assign the photos there? Nope. It creates another Christmas 2018 event. How can I merge these please?