Change holidays to special days

[bjarnef]

I think holidays should be change to special days or option to show another group for special days.
There might be some exceptions, where it doesn't follow the specific days, but where you want to use the opening hours for the weekdays as default, but then define some exception, e.g. the first sunday in a month a store is open (even it is not a holiday). Or just some days in the middle of a week where the store is closed because of rebuilding.

or e.g. adventure park which has closed in the winter season and often open in the middle of a month.

An example:

For these special days it might make sense to use select a single, multiple or a range of dates.
Maybe some of the functionality from this package:
https://our.umbraco.org/projects/website-utilities/ksumbraco7calendar/