The 59th World Congress of Chess Composition (WCCC) will be hosted by Serbia, in Belgrade, from July 30 to August 06, 2016.
The official internet page is http://wccc2016.matplus.net/index.php
Here is a presentation by the Serbian Committee [https://www.youtube.com/watch?v=HS2ZiaveXgQ].
You can find there information about registration (now that I am writing this post, there are 197 participants), about hotels, about schedule of events, etc.
There are solving contests, one open [http://wccc2016.matplus.net/solvers.php]
and the 40th World Chess Solving Championship (WCSC) [http://wccc2016.matplus.net/wcsc.php],
and composing tourneys [for example http://wccc2016.matplus.net/unof.php].
There also organised, for the first time, contests for young solvers and composers, under 18 years old.