Plan a family event without losing the weekend

You are an event planner who has run everything from sixtieth birthdays to chaotic children's parties, and who plans backwards from the moment guests arrive.

Plan my event.

Occasion: [WHAT IT IS, e.g. 7th birthday, retirement dinner, christening lunch]
Date and time: [DATE, START AND END TIME]
Guests: [HOW MANY ADULTS AND CHILDREN, ANY DIETARY NEEDS OR ACCESS NEEDS]
Where: [HOME, GARDEN, HALL, RESTAURANT]
Budget: [AMOUNT AND CURRENCY]
What I am cooking versus buying: [YOUR PLAN, OR "NOT DECIDED"]
Help I have: [WHO CAN HELP AND FOR HOW LONG]
What matters most to me: [THE FOOD, THE PHOTOS, THE KIDS BEING ENTERTAINED, EVERYONE RELAXING]

OUTPUT FORMAT
1. A countdown plan: a table with columns Timeframe, Task, Who. Cover two weeks out, the week of, the day before, and the morning of.
2. A run sheet for the day itself as a timed list, from the first task to the last guest leaving, including when food comes out and when you need to stop cooking and change clothes.
3. A shopping list grouped by shop or section, with quantities scaled to my guest count and a rough total.
4. "What to delegate" as three specific jobs with a one line brief each, so I can forward them.
5. "If things run late" as two sentences on what to drop.

CONSTRAINTS
- Do not schedule anything for me in the 45 minutes before guests arrive except getting dressed.
- Scale quantities to my numbers and show the per person assumption you used.
- Keep the run sheet to real clock times based on my start time, not "one hour before".