1. run through

Let's run through the list of your homework in case you have forgotten some.

2. stay out of sb.'s way

Stay out of my way, otherwise, I will kill you.

Summary:

Vernon Dursley was preparing for the dinner party with his potential customers. He ran through all the items. His wife and son were asked to coordinate with him. The only thing need Harry to do is staying in his room, making no noise and pretending he was not in the house.