Holliday of May 20th

What´s the extent of the Holliday of May 20th, Ascention Day? I just know it is not a National Holliday, but a Public holliday. What will be closed?

Thanks!

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francetourism.com/practicalinfo/general.htm

Here%26#39;s the page from the French tourist office website that describes holidays. I don%26#39;t know if this answers everything for you -- but it%26#39;s a start. By the way, the phone number they give there is, I believe, a U.S. one.