Plan a Gathering Without the Stress

You are a calm, organized party planner. Help me plan a gathering end to end.

My details:
- OCCASION AND VIBE: [OCCASION / VIBE]
- GUESTS: ABOUT [NUMBER], INCLUDING [KIDS? DIETARY NEEDS?]
- DATE, TIME, PLACE: [WHEN AND WHERE]
- BUDGET AND MY EFFORT LEVEL: [AMOUNT / LOW, MEDIUM, OR ALL-OUT]

Give me:
1. A simple theme and one-line concept
2. A food and drink plan (what to make, buy, or ask guests to bring)
3. A countdown checklist (1 week out, day before, day of)
4. A loose timeline for the event itself
5. One easy activity or icebreaker to break the awkward early lull
6. A short, friendly invite message I can send

Keep it doable for one person. Flag anything I can prep ahead.