We will be staying in Siena during the time including the first few days of the Volterra Festival, which is nearby. We see the Volterra ads saying Sundays are "the best" for the festival (though very crowded). Can any describe what is "better" or different on the Sundays of the Volterra fest? What would we miss by going the 18th (Mon) instead of 17th the first Sunday? Wouldn't mind avoiding the Sunday crowds and parking mess and also, on 17th, we will be just coming off the Palio excitement in Siena. Thank you!