An exhibition is the result of a effort, long preparation, documentation and collection of objects. Thus most exhibitions are unique.
Once an exhibition is finished, its atmosphere, the exposed objects and the effort taken by the organisers are soon replaced by a new exhibition. Hence, what better solution than that of making a video of your exhibition, and keep its memory always vivid.
A promotional video can be made and broadcast before an exhibition, enhancing your marketing efforts and luring the audience into visiting the exhibition.
Another choice would be that of filming the preparations and inauguration, along with interviews with the host and visitors.