The Saint Fermin festival in Pamplona, Spain is an annual celebration held from July 6-14 that includes religious ceremonies and traditions that have evolved over centuries. Key events include the running of the bulls through the streets, fireworks displays, parades featuring giant figures and masks, and closing the festival with singing at midnight on July 14th. The festival blends medieval traditions like cattle fairs with religious observances of the saint, and gained international fame through Ernest Hemingway's writings.