You are looking at a milestone that brings family together for an afternoon, which naturally keeps your food costs lower than a full dinner. Afternoon timing means you can serve finger foods, tea, and cake instead of a heavy sit-down meal, keeping the total target right around $1200.
When you have a fixed date on the calendar, lead time is your best tool. Booking early lets you lock in venue space or catering before prices jump, while smaller details like decorations and favors can easily wait until the final weeks.
The 0% intro APR period is a deadline, not free money, so make sure the balance is fully paid off before those 15 months end to avoid standard interest charges on what is left over.