Answer:
One tradition of Spain is to hold its annual Feria de San Fermin in Pamplona, where people can run with the bulls.
Another is the Feria de Abril in Sevilla where everybody who can dresses in traditional dress and has a caseta at the Feria.
Still another tradition is the celebration of Semana Santa (the last week of Lent) where the Saints and statues of Christ are removed from the Churches and lead huge processions through the streets. The saints are on floats weighing a ton or two decorated with gold and silver fittings and candles and are carried by 30+ beneath the float, some of them barefoot.
Still another tradition is the evening stroll around the city or village. This is usually lovers or families with, or without, children depending on their age.
The largest migration of the year occurs on the 16th of June when thousands of people move from inland cities to beaches for the summer. Beach town populations can increase to 5 or 6 times their normal number, or more.