In event photography, the decisive moment is absolutely crucial. This term is used when a picture should be taken at a specific time and cannot be captured a second after that. Therefore, the photographer needs to be cautious all the time for such kind of photography. Here are two series of event photography: the first one is a small reception of a gallery called Humpday Gallery in Pennsylvania, and the next one is the headquarter of an architectural office to show what usually happens. The first one is generally used for documentation or press report, and the second one is usually used for advertising purposes in the About section of the website.