I thought the festival was just weekends, but the booths are open every day for food and wine. The Celebrity chefs are just weekends. Nice surprise for me today so thought I'd share.
They haven't all been open every day, but yes, there has been at least some of the food and wine offered every day. Some of the items, like the cheese plate near the stage is only offered on weekends when the demonstrations are running. If you have an AP you also have access to Blue Sky Cellar every day. Here's the large thread where people have been discussing it: http://disboards.com/threads/california-adventure-food-wine-april-2016.3484073/