You can already picture the kids lining up for swirls of soft-serve and piling on the sprinkles. Block parties live or die by the details, and an ice cream station makes the whole thing stick in people's minds. But renting gear for a crowd means working backward from a hard deadline, and timing is everything when you are trying to keep costs down.
Weekend rentals book up fast when the weather warms, so you cannot wait until the week before. By pacing out your bookings and using the right tools to handle the $350 bill, you spread the hit so it does not wreck your groceries for the month.
That 0% window is a deadline, not free money. If you still carry a balance when the 18 months are up, interest kicks in on the remaining amount.