Saint Leopold's Day is a regional special case. People searching from Vienna or Lower Austria usually want to know whether school is closed, whether shops open, whether work runs normally and what is happening in Klosterneuburg. People from other federal states need the short answer: it is not a general public holiday.
15 November connects two layers: patron saint Leopold III for Vienna and Lower Austria, and the visible Leopoldi customs calendar in Klosterneuburg with market, abbey, wine, pilgrimage and Fasslrutschen. Both belong together, but different legal rules apply.