The way I see this is like a folder with subfolders and if necessary with sub-subfolders, like the following example shows:
Like in place categories, a house in itself is not a category, also not a church, so where do we place those items. Since we will have events in the future, what kind of events are there and were do we place them. This will make the narrative phrase easier to build and supports translation into other languages, rather than having a free text field.
So who can come up with a proposal for event categories?