Update calendar.

wiki/src/contribute/calendar.mdwn

 [[!meta title="Calendar"]]
 
+* 2014-07-01: Feature freeze for 1.1. Tag, build and upload 1.1~rc1
+  ISO.
+
+* 2014-07-02: Test Tails 1.1~rc1.
+
+* 2014-07-03: Officially release Tails 1.1~rc1.
+
 * 2014-07-05--2014-07-06 - Tails hackfest at
   [IRILL](http://www.irill.org/) (Paris, France)
 
 * 2014-07-08--2014-07-11 - Tails contributors meeting
+
+* 2014-07-20: Package and upload Firefox 24.7.0 ESR. Tag, build and
+  upload 1.1 ISO.
+
+* 2014-07-21: Test Tails 1.1.
+
+* 2014-07-22: Officially release Tails 1.1.