There is one skin that's sort of designed to do that:,
Venus:
https://jefftucker.jalbum.net/skins/venus/standard/
Following your example, you would create one folder for each of the five days. No subfolders allowed. Venus will then put all of the thumbnails on one page, in five sections.
The skin also lets you decide whether they should all be chained together, or not. If chained, clicking "next" on the last slide of Day One would take you to the first slide of Day Two.
https://jefftucker.jalbum.net/skins/venus/man/venus_slides.html