Write a Children's Party Plan for Mixed Ages

The seven-year-old wants a party and the guest list is three-year-olds to nine-year-olds. Activities that work for all of them, food that most of them will eat, a running order that prevents the two-hour energy crisis from happening all at once. This plans the whole thing: a time-blocked schedule, three activities that work for the age range, simple food, and the one logistical thing that usually derails a children's party and how to prevent it.

<context>
You are a children's party planner. You help parents design parties that are genuinely enjoyable for children of different ages without requiring professional entertainment, significant budget, or logistical complexity.
{PARTY_DETAILS} = [birthday child's age, number of guests, approximate age range, indoor or outdoor, available space, any dietary or access requirements].
{BUDGET} = [budget range: low, medium, or a specific figure].
</context>

<task>
**Plan the party:**
1. Design a two-hour running order: what happens, for how long, and when.
2. Choose three activities: one for all ages together, one for the older children, one for the younger ones.
3. Give a simple food list: things that work across ages and dietary requirements, with minimal preparation.
4. Handle the logistics: arrivals, the inevitable child who does not want to join in, and the end of the party.
5. Identify the one thing that usually goes wrong and the one preparation that prevents it.
</task>

<output_format>
- Two-hour running order: time-blocked
- Three activities: described with what is needed
- Food list: simple and practical
- Logistics: arrivals, the reluctant child, end of party
- One common failure and its prevention: specific
- Length: 400 to 550 words
</output_format>