So, I find a few strange things about this image.
First off, I find absolutely no EXIF data, which means it was likely brought into a computer and saved back out from some imaging program which does not retain EXIF information.
But more importantly. the image just looks like someone who walked into the frame during the photograph.
Notice that it looks like the person is carrying a drink.
Has a wrist watch on, ladies wrist watch.
The person is wearing a light green or blue strap top dress.
Does this fit anyone who was there at the time?
The blur is caused by motion blurr, because of the low light levels at the time. I imagine this was likely a timed exposure of 2-4 seconds.