A couple of things we only have words to communicate with so it is critical to use them correctly
There no such thing as "an event folder"
You have albums - these point to photos in the ibrary (and no space is used)
You have folders - these hold albums or other folders - they do not hold photos
You have events - these are one way to view all of the photos in your library (the other is Photos with or with out event titles turned on)
What I suspect you did was create a holiday album and drag frou events to it - this would give you an album with all of the photos from those event in is
If you want a structure as you requested select that album and press delete deleting it
Follow TD's instructions and create an album for country 1 - drag all of the photos about country 1 to it
do the same for each country
Then create a folder (file menu ==> create folder) named hollidays and drag the country albums to it -- now if you select the album you will see all photos for all countries and you can select each country and see just the photos for it
You can make this as deep as you choose - so you could have albums for city 1, city 2, etc all in a folder for country 1 - and all countries on a continent in a continent 1 folder -- or any other stucture you want
And a photo can be in multiple albums with no penalty sinc eno space is used to have a photo in an album
LN