The most important part of this is to know the layout of the location, and to make sure that you visit it before the shoot. You want to know where all the entrances and exits are, any places that you may be able to tuck yourself away in case of emergency, and a place to hide your equipment if need be. From here you may want to do a brief run through, staging a sequence where you may need to leave very quickly. The same is going to be true if you are just entering a location where no event is taking place but you are still not welcome with a digital video camera. These could be things like a private business or government building, where you may want to enter and get footage quickly and then run out before security or police personnel are able to interfere. This time you could not take the camera in for a run through, but make sure you know the ins and outs of the location well. If it is exceptionally large you may want to either construct or look at a map of the area. Blueprints are great option if it is significantly large, and these you can often get from your local city hall or chamber of commerce (depending on the area and the situation). If it is a public or historic building you may even be able to get hold of them at the public library. If it is a fully outdoor location you may have trouble planning it much ahead of time because they may have changed the accessibility. For example, if an event is taking place at a fair ground you are not going to get a good idea of where the exits are when it is just open space. You must first wait for the area to be prepared for the event before you stake it out.