Get there before 10 to make sure you get in when it opens. If you book online you can get into the harry potter section at 9. Have fun
You can get in when it opens with appropriate tickets.
When it opens, you can go right in as long as you have the pass.
It's suggested to book online in advance and get entered on time so that you don't miss out any event.
You can go by 10 and should be able to enter
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