Building a robust email list is the cornerstone of successful email marketing. Event organizers can collect email addresses through various methods: 1. Event Registration: Capture emails during the registration process. 2. Website Sign-Ups: Use sign-up forms on your website to gather email addresses. 3. Social Media: Promote your newsletter on social media channels to attract new subscribers. 4. Incentives: Offer incentives like discounts or exclusive content to encourage sign-ups.