Assuming your goal is WWoHP at IoA, I'd be at the turnstiles no later than twenty minutes before EE starts--7:40a. It is not unusual for TMs to open the gates around then. I'd be arriving at the garage around 7:20a. If you don't have ticket media yet, allow for another 5 minutes or so. Others' opinions may differ.
If you do EE and Ollivander's is on your to-do list, go there first. Resist the temptation to go to FJ first. If you don't care about Ollivander's, then go to FJ first.