Imported holidays are automatically categorized

Mail template provides a functionality of importing holidays from Domino directory on a server. Importing holidays, imported holidays are stored in your mail file's calendar as anniversary event type.
Imported holidays are treated the same as personal anniversary entries that you have personally created.

I would like Notes provides a functionality so that you can easily distinguish imported holidays from personal anniversaries so that you can easily tell which entries are public and which are personal.

One idea of making it work is that Notes automatically sets a category to holidays when they are imported as you can set custom colors for each of categories.