Imagine the street blocked off, the grill smoking, and everyone actually hanging out for once. Getting there takes work, but planning in early spring saves you from the last-minute stress of chasing neighbors for cash or overpaying for supplies.
A typical block party costs around $400. If you break that down into small, predictable payments, it feels much lighter on your wallet than one big hit in July.
Remember that the 0% intro window is a deadline, not free money. If you have a balance remaining after the 18 months are up, you will start paying interest on whatever you still owe.