You don't have to, but I definitely would. You don't want to have to wait around a long time. We made ours a week ahead, but the people are very accommodating and do their best to work with you.
Recommending making reservations
For holidays like Valentines 2018 don't be surprised if they are booked. If I recall correctly, reservations are recommended for weekends. As for making them, you can call them. The website really does have all the needed information for your special day.
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