A still camera is always significantly smaller than any video camera out there, and the shots can often be taken in just a moment. Try going to the location, or a similar location, ahead of time and take a number of test shots. Get your settings according to the light and character of the scene so you will be able to get good images without preparation in the moment. Since you have to be ready at any moment, and because you do not have the ability to constantly record images like you do on video, you need to keep the camera in a location on your body that is both hidden and easily accessible. From here you need to take as many photos as you can, each trying to capture the most significant moments of the event.