Step 01
Four tools and a spreadsheet, replaced.
Ask most teams where their marketing calendar lives and the honest answer is that it does not. The emails are scheduled in one tool, the posts in another, the texts in a third, and the shared view of all three is a spreadsheet somebody updates on Monday. It is wrong by Wednesday, and nobody trusts it by Friday.
Here the calendar is not a copy of the schedule. It is the schedule. Anything queued anywhere in GenieOS appears on it the moment it is queued, because the thing that renders this view is the same thing that will send the email. There is no sync to fall behind.