Programmer's Day?

The 13th of september, the &c0100 th day of the year, is on a Sunday this year, the day of the week you’'ll not find me programming.

why not??

The calendar will not dictate me when I work!

The week has 7 days and I decide when I work.
Especially for making a trip with children to some sight seeing (castle) or entertainment park, it may be much better to be there on a normal week day and avoid the weekend.

Christian: EuropaPark ?

Europa Park is for older ones. Mine go more to something like Lochmühle:

A few carrousels, a very little roller coaster, some slides, a train and some other little rides.