Concerts and Theater in Nice

We will be arriving in Nice one day prior to the Provence - Paris Tour and are looking for concerts and theater events to attend on Saturday evening April 14 and Sunday matinees April 15. I have checked the major opera houses and concert halls in Nice and Monte Carlo and all seem to be dark on Saturday and Sunday. This is hard to believe. I am hoping I am missing something here. Any suggestions would be greatly appreciated. Thanks
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