Reportage
The process or method of gathering and presenting news. The term "photojournalism" comes from the field of photography and refers to the skill of delivering a news narrative using photographs. There are a lot of wedding photographers who offer images in a "reportage style." This merely denotes that the activities of the day are treated and recorded in the same manner as they would be if they were news events, albeit in a manner that is casual and inconspicuous.
Do you have a better definition? Share it in the comments.