A private brewery tour is the highlight of the weekend, but Saturdays fill up months in advance. Secure your date now so you aren't scrambling for a backup plan at the last minute.
Once the date is set, you can manage the $600 price tag without draining your checking account all at once. Breaking it into smaller chunks makes the group outing much easier to swallow.
Remember that the 0% window is a deadline, not free money. If you have a remaining balance after the 18 months are up, you will start paying interest on whatever is left, which defeats the point of splitting the cost.