October sneaks up fast when you are organizing the whole street, and the rush for bulk candy and decorations always hits before you are ready. Grabbing what you need two weeks out gives you the best pick of the stock without paying rush shipping or settling for leftover scraps.
A typical US block party runs around $400 for supplies, which can sting if you drop it all in one paycheck. Spreading that cost out over time keeps your own bank account stable while you get the neighborhood together.
The 0% intro window is a deadline, not free money, so make sure you clear the balance before those 18 months are up. If you leave a leftover balance when the period ends, the remaining amount will start racking up interest.