This coming weekend (November 19th-20th), 500px will host an event called Pixel Hack Day. The purpose of the event is to allow photographers and programmers to get together to create interesting visual applications which can be shown over the web, on mobile devices and desktop platforms. At the end of the two day event, prizes will be awarded to the best “hackers”. If you are interested in attending, there is still time to register. Just follow the link below.