A great party relies on momentum, and booking your mobile bartender two months out is the only way to lock in the best vendors before they hit their peak summer schedule.
Once you have your date confirmed, you can stop worrying about the upfront cost and start focusing on the drink menu.
That 0% intro APR is a window to pay off your balance interest-free, not free money. If you still have a balance after those 15 months, the standard interest rate will kick in on whatever is left.