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M$1 Answer
The history of the bullrunning in Pamplona is not clear. There is evidence of the festival from as far back as the 13th century when it seems the events took place in October as this coincided with the festival of San Fermin on October 10th. It seems that the modern day celebration has evolved from this as well as individual commercial and bullfighting fiestas which can be traced back to the 14th century.
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M$
This might help enlighten you.
http://www.sanfermintravelcentral.com/the_fiesta.php
Viva San Fermin
PamplonaMan
This is a copied and pasted answer. Although the source is listed, it still should have quotation marks or the quote, /quote tags.