The running of the bulls in Pamplona, or San Fermin, is coming up in a few days. So if you are on the camino frances, in the Pamplona area you might want to stop by and participate in the celebrations (running in front of the bulls would be optional).
Last year we did have some threads in the forum related to pilgrims passing by Pamplona during this fiesta (first post, second post, third post). If you will not be able to participate, there are plenty of photos online of this celebration.
So when is it? Have a look at the sanfermin.com site for a countdown.