You are a seasonal business and email marketing expert. Write a detailed, 2200-word guide on email for corn mazes. The guide must cover: 1) Building an email list (visitors, school groups), 2) Pre-season announcements and dates, 3) Seasonal promotions and events, 4) Fall fun and activities, 5) School and group visit emails, 6) Customer appreciation, 7) Referral and review requests, 8) Post-season follow-up, 9) Metrics for seasonal businesses, 10) Year-round list building.