There are probably multiple ways you could do this, but here’s an option.
Create 1 table for Newsletters, 1 for Ads, and 1 for Schedule. Create a linked record field between Newsletters and Ads, and then create a linked record field between Schedule and Newsletters.
Then, add a Lookup field in the Schedule table that looks up the Ads field inside the Newsletter table. Create specific views with filters by date.
You might consider hiring an Airtable expert in the Hire a Consultant channel or view a list of consultants here who can help you with the best way to structure it.
Hannah - On2Air.com - Apps for Airtable - Dashboards, Forms, Backups, and Documents