June graduation weekends fill up fast, and the good backyard caterers book their dates by early spring. If you wait until May, you'll be scrambling or settling for whoever is left. Getting ahead of the timeline is the only real lever you have to keep costs from spiraling out of control.
A typical US catered taco bar runs about $750, which is a solid chunk of change to drop all at once right before summer. We can break that down so it doesn't sting your bank account, using the Citi Simplicity® Credit Card and its 0% for 18 months on purchases and balance transfers from date of account opening to spread the hit.
Remember that the 18-month intro window is a hard deadline, not free money. If you still have a balance left on the Citi Simplicity® Credit Card when those 18 months end, deferred interest will kick in on the remaining amount and cost you extra.