The Edinburgh Photographic Society has been running an annual open exhibition since its founding in 1861; this is believed to be the oldest continuously running photographic exhibition in the world. That's one and a half centuries, which makes my paltry two-decade-or-so stint as the exhibition's Database Wrangler look rather paltry.
This year, the 150th Annual Exhibition of Photography will be held in Edinburgh from the 7th of August to 4th September. Entries for the exhibition close on the 22nd of June, which means that you still have time to participate if you're quick.
This year, the awards available have been extended to commemorate the 150th Exhibition, so if you have ever considered entering this would be a great time to do so.
Entry forms and copies of the rules can be found at: