Throwing my kids first birthday party for entire class, when to order pizza?

My daughter is turning 7 and we invited her entire class (19 kids) to come to our house for a 2 hour party. We live in a typical suburban neighborhood so cars will be lined up and down the street for a few hours.

I've never thrown a birthday party. Should I order a variety or pizzas and pick them up before party (hoping they don't get cold) or order them during party and hope that 10 pizzas arrive in time and the driver has enough room to deliver?

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