Je suis tombé par hasard sur cette page listant les principaux festivals des différentes régions tunisiennes sur le site www.carnaval.com avec la présentation suivante :

Festivals in Tunisia

Even the smallest village sets aside a time for celebration whether it be for the summer harvest, fishing season, a local saint, or the arrival of Spring. Cultural events in Tunisia are various and well promoted all over the country.

The Arts and Music festivals once prominently held during the peak summer period of July-August have a tendency to move to dates which expand the availability of hotel rooms.

Tunisia Festival Guide