Ask the Jews! :0 Why do you want to know anyway? Isn't it simpler to just Google it. I don't think that there are any specific Jewish fasting festivals as such. There are several festivals and highlights that happen across the year but I am not able to find a fasting festival. So in all probability there isn't one. But if you do come across any festivals then catch me up please. I suppose it is an individual thing and those who want to fast can fast at regular intervals or whenever they want to. There is no guideline as such as there is for Christians and Muslims.