Build a monthly content calendar

Background:
Business and what we sell: {{business}}
Audience: {{audience}}
Month: {{month}}
Goals for the month, most important first: {{goals}}
Channels, and how many pieces we can realistically make each week: {{capacity}}
Our content themes: {{themes}}

Key dates this month (launches, events, promotions, deadlines, holidays that matter to us):
"""
{{key_dates}}
"""

Content we already have and can reuse (articles, videos, photos, case studies, FAQs):
"""
{{existing_assets}}
"""

Task: Build a content calendar for the month that serves the goals above, within our capacity.

Requirements:
- Plan to our capacity, not beyond it. A calendar we cannot keep up with is worse than a shorter one.
- Tie every piece to one goal and one theme. If a piece serves no goal, leave it out.
- For each key date, plan the lead-up (announcement, reminder) as well as the day itself. Use "last chance" only where a real deadline exists.
- Reuse what we already have: turn one source piece into several channel versions before planning anything new.
- Leave one open slot per week for something timely we cannot plan yet.
- Use only the dates listed. Do not add awareness days, holidays or trends that are not on our list, because invented or irrelevant "national days" are a common mistake in generated calendars.

Format:
1. A table in date order with the columns Date, Channel, Goal, Theme, Idea (one line), Format, Reuses (the existing piece, or "new"), Prep needed.
2. "Prepare in advance": anything that needs lead time, such as photos, approvals or guest contributions, with the date it is needed by.
3. A summary under 100 words of how the month balances across goals and channels.

Example row, for form only: Tue 4 | Email | Goal 1 | Customer questions | Answer the three questions we hear most about [product] | Newsletter section | FAQ page | None

A good result is a calendar a busy team could follow without another planning meeting. If the goals and capacity conflict, or a key date is missing a detail you need, say so above the table and suggest what to drop. Do not guess dates.