SM’ART the annual art extravaganza which normally takes place in Aix in May, is just one of the events which has been postponed, in this case to mid-September. Others have had to be cancelled completely.
Here is a list from the tourist office: https://www.aixenprovencetourism.com/agenda-des-evenements/les-grands-rendez-vous-aix-en-provence/ Thanks to Jennifer for this useful information.
Update: if this link doesn’t work, you can reach this information via the tourist office website: go to ‘agenda des evenements’ which has a photo of the Aix Festival stage. Scroll down and click the box headed ‘ Les grands rendez-vous’ which is where the list can be found.
aixcentric 
Thank you for the update! Unfortunately, the link did not work, and I was not able to find it on their website. Any suggestion? Thanks!
I checked it when I did the post yesterday, but it seems to have been taken down. Thanks for letting me know. Perhaps they are revising the listing but that seems odd on a Sunday. I will keep an eye open for a new list. Thanks!
Thank you Lynne!