Microsoft Outlook is a web-based suite of webmail, contacts, tasks, and calendaring services.
Remind creative owners of deadlines and log each notice in the sheet.
Your task owners get timely due date reminders by email. Your team hears about overdue work, and your Google Sheets task list tracks notices.
Keep creative project deadlines current in the team calendar.
Your project list and calendar agree when dates move or plans get canceled. Owners see what changed in a project comment.