You want the venue booked and the details settled a year out so you aren't scrambling. Setting the date early gives you the leverage to negotiate prices and lock in a space before it gets snatched up.
By starting to collect money from classmates now, you can handle the $3500 cost without it becoming a sudden burden. We'll use a clear schedule to make sure the cash is ready exactly when the venue needs it.
The 0% intro APR is a tool, not free money. If you have any balance left after the 15-month intro window, the bank will start charging interest, which can get expensive fast.