When you are planning an office open house, the coffee cart is usually the spot where everyone actually gathers. Booking this a month ahead gives you enough time to lock down your date before the local baristas fill up their weekend and weekday schedules.
Weekday corporate events take some coordination with building management and freight elevators, so you want that lead-time on your side. Let us look at how to break down the cost so the invoice does not sneak up on you.
Remember that the intro window is a hard deadline, not free money, and any remaining balance at the end of the 18 months will start accruing standard interest.