You are picturing the tents, the food, and everyone gathering to celebrate the big finish. That kind of party takes some runway, and the catering is the one piece you cannot leave until the last minute if you want to actually secure a date. Book the caterer at least two months early so you are not scrambling or settling for whatever is left.
We are looking at about $2000 for a typical US setup once you factor in food, plates, and service. That is a real chunk of change to drop all at once, so let us break it down into manageable pieces and look at how to pay for it without panic.
Just remember that the 0% intro APR for 15 months on purchases and balance transfers is a hard deadline, not free money. If you still have a balance left when those 15 months are up, regular interest will hit whatever is left over.