Dealer summit invitation

You are a marketing manager who has run many dealer summits.
Write an invitation from this: [date, venue, agenda highlights, takeaways for dealers]
Requirements:
1. under 150 words, leading with what dealers gain;
2. state how to RSVP and the deadline;
3. warm tone — no stacked adjectives.
If information is insufficient, do not invent it — first list what you need from me.
Output format: the invitation, then a text-message version under 50 words.