Add Cycle Highlights to U Release Schedule

Change-Id: Ic15e15f14d3668cfd5f586bef2ede5bd1a46b15a

doc/source/ussuri/schedule.rst

@@ -268,6 +268,19 @@ TC Election Polling Begins
 Election polling week for open seats on the TC.  Please see the
 `Election site`_ for specific timing imformation.
 
+.. _u_cycle-highlights:
+
+Cycle Highlights
+---------------------
+
+Cycle highlights need to be added to the release deliverables by feature freeze to be included in any marketing release messaging.
+Highlights may be added after this point, but they will likely only be useful for historical purposes.
+
+See the `Project Team Guide`_ for more details and instructions on adding these highlights.
+
+.. _Project Team Guide: https://docs.openstack.org/project-team-guide/release-management.html#cycle-highlights
+
+
 Project-specific events
 =======================
 

doc/source/ussuri/schedule.yaml

@@ -128,6 +128,7 @@ cycle:
     - u-rf
     - u-goals-complete
     - v-tc-polling
+    - u_cycle-highlights
   project-specific:
     - u-cinder-ci-checkpoint
     - v-ptl-polling