What pizza delivery place would actually try to deliver 1000 pizza's?
Our high school, due to having no cafeteria for a while, ordered once or twice a week hundreds of pizzas from several pizza places.
And we have a professor at our university who always promises to give everyone free pizza if more than 25% of the class are still there the week before the exam. Sometimes it works, sometimes too many fail.
But ordering many pizzas, especially online, is possible.
Although some places will call you back to confirm