Draft Thank-You Notes (Attendees, Sponsors, Vendors)

Draft a template for a thank-you email/note to be sent after '[Event Name]' to '[Recipient Group, e.g., 'All Attendees', 'Our Platinum Sponsors', 'Keynote Speakers', 'Our Valued Vendors', 'Volunteers']'. The note should:
- Express sincere gratitude for their [participation/contribution/support].
- Briefly mention a positive highlight of the event or their specific involvement.
- [Optional: For attendees/sponsors - Tease or invite to future events or provide link to resources].
Keep the tone [e.g., appreciative and warm, professional and grateful].