Prepare a comprehensive timeline for notifying vendors of an upcoming compliance audit, ensuring all regulatory requirements are met. Include key milestones, such as sending initial notifications, follow-up reminders, and submission deadlines for vendor compliance documents. The notification should also clarify the scope of the audit, required documentation, and deadlines. The timeline must reflect any region-specific regulatory differences for [Region] and allow sufficient time for [Vendor] to compile necessary documentation. Deliver the plan in a formal email template format.