Shops Champs Elysees 1. May

Does anyone know if the shops on the Champs Elysees are open on the first of May?

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francetourism.com/practicalinfo/general.htm

Here is the page from the website of the French tourism office in the U.S. that discusses holidays. It indicates shops would be closed on May 1, and that is what I recall from the one time I was in Paris on May 1. However, I also recall a few small neighborhood shops were open. As far as the Champs Elysees is concerned, I don%26#39;t know.