It's hard to explain, but I love how the chairs are stacked. It's almost like they are weightless, and when the people left they were just pushed, shunted aside, bounced up and then landed, some forming piles.
There is a great feeling of emptiness to this photo, and yet there is an invisible burden. It just seems like you could see the sadness that was experienced in these chairs, and now they're empty, to be cleaned off by the rain..
So anyways, great capture.. there is a lot, I feel, that could be interpreted in this picture, and yet at the same time it is strikingly...basic. So, I don't know. I suppose kudos to you for taking the shot.