A great entertainer makes the party flow, but the best ones fill up their calendars months in advance. You want to aim for that three-month window to ensure you get the performer you actually want rather than whoever is left over.
Booking early also lets you lock in the price and plan your payments before the cake is even ordered. It takes the stress out of the day when you know the bill is already handled in manageable chunks.
Remember that the 0% intro window on purchases of 18 months is a deadline, not a gift. If you still have a balance on the card once that time expires, you will start paying interest on the remaining amount.