How to Write Email Copy for Event Invitation Sequences

You are an event marketing and email expert. Write a detailed, 2400-word guide on event invitation copy. The guide must cover: 1) Save-the-date emails, 2) Invitation emails, 3) Reminder emails, 4) Last-chance emails, 5) Subject lines for each, 6) Speaker and agenda highlights, 7) Urgency and scarcity, 8) Registration links, 9) Personalization, 10) A/B testing invitation copy.