Issue
You have an upcoming event and you have been unsuccessfully been able to "confirm" the event on the Marketing Event Calendar.
Solution
Only batch assets can be "confirmed"/approved on the Marketing Event Calendar.
If the error displays "Invalid Campaign" - check the campaign that you are trying to confirm. If it is a Trigger Campaign, that is why it's unable to be confirmed.
Batch assets include Batch Campaigns, as well as Email Batch Programs.
.png)