Add OHM2013 activity.

[wiki] / activities.mdwn

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@@ -5,6 +5,13 @@ you are holding a meeting or writing an article about VPNs and also
 mention tinc, please [[tell us|contact]]. If you know of any we have
 not listed here, we would also like to hear about it.
 
+
+### Upcoming events
+
+* [OHM2013](https://ohm2013.org/site/),
+  July 31-August 4, 2013, near Alkmaar, The Netherlands.
+  We are present in the [Milliways village](https://ohm2013.org/wiki/Village:Milliways).
+
 ### Past events
 
 * [Chaos Communication Camp](http://events.ccc.de/camp/2011/),