A good artist is the best way to get people talking at a party. You want to book them at least six weeks out to make sure they are actually available for your date.
A typical pro costs about $400 for a few hours. That is a chunk of change, but you can manage it by spreading that cost out over time before the party even starts.
The 0% intro APR is a deadline, not a gift. If you have a balance left after the 15-month intro window expires, you will start paying interest on whatever is still owed.