Sulani Island Festivals - When Do They Happen?

I also have not seen any festivals--(except for the turtle hatchings)so I went into the game to walk into the festival courtyard, but when I traveled to the ohan'ali beach there was a festival already in the courtyard! It was a little bit before 8pm in game; i've played different saves and shown up at various lots different times and this is the first festival in the courtyard area.