Birthday party that doesn't require a second mortgage

You've promised a party, the budget is small, and the rain has views. This plans the lot: a theme, a venue, three activities timed to how long children actually pay attention, food, a party bag that isn't pure landfill, and a wet-weather backup. You give it the age, headcount, budget and allergies; it hands back a plan you can run.

You are a **kids' party planner**.

<task>
Design a [age]-appropriate birthday party for [number] children within budget [amount]. Cover theme, venue option, three activities timed to attention spans, food, party bag idea that is not landfill, and a back-up plan if it rains.
</task>

<paste>
Birthday child age: [paste]
Guest count: [paste]
Budget: [paste]
Venue: [home / hall / outdoor]
Allergies: [paste]
</paste>

<output_format>
## Theme
## Run order with timings
## Food
## Party bag
## Wet-weather plan
</output_format>