Looks like there's an active club in Nice. Their schedule from
this spring shows a lot of events in the general area (not all in or near Nice), so I imagine the same would be true next year. Look under the "Lieu" column for location for some google mapping.
There's a "Contact" email address at the top of the
main page, I'd try shooting him an email in English to see if he can give you more specific info. (And you'll probably win points if you start it with the one or two French words you might know. ;-) )