Turning fifty deserves a proper room with your favorite people instead of shouting over a crowded dining room. The secret to pulling this off without a financial hangover is simple math and enough lead time to lock down the details.
You want to book that private dining room two months ahead so you actually get the space and date you want. A typical US event runs about $1200 once you factor in food, drinks, and the mandatory tip for the staff.
That 0% intro window is a hard deadline, not free money. If you still have a balance left when those 18 months are up, the card kicks in high interest on what is left over, so make sure the math clears before the clock runs out.