Add Cycle Highlight Dates to Wallaby

Change-Id: I7e1d73cab428e893c1ea0145e7ee76e5d865fdf3

doc/source/wallaby/schedule.rst

@@ -185,6 +185,21 @@ Open Infrastructure Summit
 The Open Infrastructure Summit is expected to take place some time in May.
 Exact event dates are yet to be determined.
 
+.. _w-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/wallaby/schedule.yaml

@@ -96,6 +96,7 @@ cycle:
     - w-soft-sf
     - w-rf
     - w-goals-complete
+    - w-cycle-highlights
 - end: '2021-03-19'
   name: R-4
   start: '2021-03-15'