You are an event content marketer. Write a detailed guide on using content to promote events and repurpose event content. The guide must cover: 1) Pre-event content: speaker announcements, agenda previews, attendee benefits, 2) Content for driving registrations: landing pages, emails, social media, 3) During-event content: live social updates, behind-the-scenes, attendee interviews, 4) Post-event content: recap videos, session recordings, speaker interviews, 5) Repurposing event content into blog posts, ebooks, videos, 6) Nurturing event attendees with follow-up content, 7) Measuring event content success: registrations, attendance, engagement, leads, 8) Examples of successful event content campaigns, 9) Budgeting for event content, 10) Integrating event content with overall content strategy. Provide an event content timeline.