Add links to existing not-yet-scheduled sessions

Change-Id: Iabd53a73c4e42308cec6cf175ab4ccb099e6215d
diff --git a/schedule.md b/schedule.md
index 081a54a..7daeccd 100644
--- a/schedule.md
+++ b/schedule.md
@@ -71,3 +71,8 @@
 | 14:45 | **Gerrit Code Review Talk #12**                  |
 | 15:30 | Break, Expo & Networking                         |
 | 16:00 | Conference wrap-up and Closing Keynote           |
+
+### Not-yet-scheduled sessions
+
+* [How to extend Gerrit using Scripting Plugins](sessions/gerrit-scripting-plugins.md) _Luca Milanesio / GerritForge_
+* [Mining Gerrit Data to Study Contentious Reviews and Community Evolution](sessions/mining_gerrit.md) _Shane McIntosh, McGill University_