Update communication/marketing-team/event-checklist.md

Co-authored-by: Matt Broberg <[email protected]>

Author: chris-short

communication/marketing-team/event-checklist.md

@@ -1,5 +1,7 @@
+TODO - this document is intended to outline all Contributor Communications team activities to support a major event, like KubeCon. Please add to the list as we learn. See the [Marketing Team README](./README.md) for info on the team.
+
 # Pre-Event (KubeCon) Checklist
 
 * Email to k-dev about maintainer sessions, meet the maintainer, peer group mentoring, etc. (Example: https://groups.google.com/g/kubernetes-dev/c/FDwGepXJK5s/m/kOwtU7X2BwAJ)
 * Tweets about maintainer sessions throughout the week
-* 
+*