I was born near Pamplona and enjoyed the festivities for some years. I wouldn't recommend anyone to take part in the bull run, because in my opinion it's pointless, but well, it's exotic.
You don't need to register or do anything too special to run the bulls. It's free, and anyone can do it, given they are reasonably fit and fully conscious of the risk they are undertaking. There are special police reinforcements and a volunteering troupe ('naranjitos') that try to make sure that anybody that's under the influence or for any other reason is deemed unsuitable to run the bulls, won't enter the Encierro. They will help you out with directions or general information about the city too.
'Yes, over there'. Or else.
For your information, encierros begin at 8 AM every morning during the festivities, and start at the Corral de Santo Domingo, near the town hall. It's usually packed with people, mostly watchers who wake up early... But also party-goers pulling an all-nighter, something fairly common in the crazy hectic scenario of San Fermines. In the past, many people, especially foreigners, showed up too drunk to run safely, and that's the reason why the Encierros are controlled by the police.
The Pamplona town council has issued a list of warnings and recommendations for those willing to run the bulls:
As well as being the best known act of the Sanfermines the Bull Run is also the most dangerous. In order to ensure that the Run goes off successfully and to avoid danger it is advised that the spectators and runners bear in mind certain minimal rules which guarantee the normal running of the Bull Run.
For this reason it is expressly forbidden:
1.- To admit anyone under the age of 18 into the course as minors are totally prohibited from running or participating.
2.- To go over the police barriers which the authorities see fit to erect.
3.- To place oneself in the zones and areas of the itinerary which are expressly indicated by the agents of the authorities.
4.- To hide oneself before the release of the bulls in corners, dead angles or doorways of houses or establishments located throughout the length of the course.
5.- To leave open the doors of the houses along the course, the owners or tenants of the said property being responsible for this.
6.- To enter into the route in a state of drunkenness, under the effects of drugs or in any inappropriate state.
7.- To carry objects which may impede the correct running of the Bull Run.
8.- To wear clothes or shoes which are not appropriate for the run.
9.- Call the animals or distract them in any way and for whatever reason in the course or during the rounding up in the Bull Ring.
10.- To stop in the Bull Run or station oneself on the walls or barriers or in the doorways in such a way as to impede the run or the defence of the runners.
11.- To grab onto, harass or mistreat the animals or obstruct their exit enclosure by any action during the amateur bullfight.
12.- To take photographs from the streets, walls or barriers without due authorisation.
13.- Any other action which may impede the normal running of the Bull Run.
If you comply with these rules and feel like doing it, nobody will stop you :) However, if you are from abroad, I'd recommend you to ensure that you have proper health insurance and that your company would cover the cost of health assistance, just in case something happened. Not that many people are actually hurt given the number of runners, but if I were you, I'd do it in the safest possible way.
You should also take into account that many, many, many people come to Pamplona during San Fermines. The population in the city ramps up from the usual 200,000 to about 3 million. (Yes, the streets are packed). Bookings for hotels can be really expensive and are usually closed months before the festivities, that take place in the week that follows July 7th. So if you want to come, do book well in advance, and prepare your wallet.
Table above taken from:http://www.spanish-fiestas.com/s...