(Reposting after @Richard_Sather helped 
)
It would be great if we have the option to add public holidays automatically to the calendar - and then block them like we can do with weekends.
What I am asking for is not a workaround like we have to currently do (create our own public holiday calendar to track, and then assign the days as tasks to our team and projects - and then use search and rules and manually move tasks dates [I see your video @Bastien_Siebman and it is a good idea])
I just want the tool to have this function built in!