I was uncertain where to place this but here seemed a good spot. The NY Times is having a moment in time, where they are asking people around the world to take a picture Sunday, May 2 at the same moment, namely at 15:00 UTC (they have a link to a convertor so you will know when it is in your location). You can then upload the photo over the next 5 days to the NY Times, which is not having prizes (so it is not really a competition) but rather some of the photos will be highlighted by NY Times itself, or you can browse by country, subject or anything else.
I know it is a little goofy and will be a little more difficult to upload for us Luddites, but I think this is a good idea. Check it out.