A quiet weeknight dinner with a private musician is all about the atmosphere. Focusing on a mid-week date usually means better availability for performers and lower demand for prime venue spots.
You want to lock in your talent at least six weeks out to get your first choice. Use this time to build a buffer so you aren't scrambling when the final invoice arrives.
The 0% intro APR is a deadline, not a gift. If you still have a balance after the 15 months are up, the card will start charging interest on whatever remains, which can get expensive quickly.