Fix broken links, use https:// where available.

[wiki] / activities.mdwn

diff --git a/activities.mdwn b/activities.mdwn
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+++ b/activities.mdwn
@@ -20,9 +20,9 @@ not listed here, we would also like to hear about it.
   in Palm 4 from 10:15 to 11:00.
 * [OHM2013](https://ohm2013.org/site/),
   July 31-August 4, 2013, near Alkmaar, The Netherlands.
-  There was a lightning talk about tinc ([slides](/presentations/OHM2013/The_tinc_VPN.pdf)) in T2 at 15:55 on August 1, a talk about [ChaosVPN](http://wiki.hamburg.ccc.de/index.php/ChaosVPN) in T6 at 13:00 on August 1,
+  There was a lightning talk about tinc ([slides](/presentations/OHM2013/The_tinc_VPN.pdf)) in T2 at 15:55 on August 1, a talk about [ChaosVPN](https://wiki.hamburg.ccc.de/index.php/ChaosVPN) in T6 at 13:00 on August 1,
   and combined workshop for tinc and ChaosVPN at the [Milliways village](https://ohm2013.org/wiki/Village:Milliways).
-* [Chaos Communication Camp](http://events.ccc.de/camp/2011/),
+* [Chaos Communication Camp](https://events.ccc.de/camp/2011/),
   August 10-14, 2011, in Finowfurt, Germany.
   We were present in the [Milliways village](http://events.ccc.de/camp/2011/wiki/Milliways).
 * [FOSDEM](https://archive.fosdem.org/2011/),
@@ -65,7 +65,7 @@ not listed here, we would also like to hear about it.
   [slides](/presentations/linuxexpo-20010123/),
   or download the
   [presentation](/presentations/linuxexpo/slides.tgz).
-* [NLLGG](http://www.nllgg.nl/) meeting,
+* [NLLGG](https://www.nllgg.nl/) meeting,
   October 7th, 2000.  
   You can look at a copy of the
   [sheets](/presentations/nllgg/tp.ps.gz) we used.