Retirement parties are all about the moment, but the stress happens months before. You have to nail down the venue early so you aren't scrambling for a space when the date rolls around.
Booking the community center two months out gives you a clear window to manage the $1200 cost. Use the 15-month timeline to pace your payments instead of wiping out your savings in one afternoon.
The 0% intro APR is a deadline, not free money. If you have a balance left on the card after the 15 months end, you will start paying interest on whatever remains, so stick to your schedule.