You are picturing the room filled with family, the baby passing from aunt to uncle, and the quiet relief once the speeches are over. Sunday afternoon private restaurant rooms book up months in advance, so lead-time is your real lever here. Getting the space locked down early stops you from scrambling later when options dry up and prices spike.
We can break this $900 target down so it doesn't hit your checking account all at once. By knowing what to book right now and what can wait until next month, you keep total control over the spending without cutting corners on the food.
Keep in mind that 0% intro APR for 15 months on purchases and balance transfers is a deadline, not free money. If any of the $900 balance is still sitting there when the 15 months run out, standard interest will kick in on the remaining amount.