Sunday, 3 June is Pentecost Sunday - Monday used to be a holiday (France,UK & Spain). I think the Feria del Campo (AKA el Rocio) in Huelva happens that week. I may be passing thru Madrid heading south (aeropuerto de Barajas to Puerta de Atocha) early that week for the festivities in Andalucia. I will be moving fast!