Just like most theaters no outside food or drink. It gets smuggled in, 4 dollars for a small box of licorice is a little excessive.
The rules are no outside food. However, there may be an unwritten rule of don't ask don't tell, or more like don't see, dont know.
They're probably not going to allow you bringing anything too substantial, but I don't think anyone's going to care if you try to bring in some small snacks or drinks
Inside Easton actually, you can take your food from one restaurant to the other yes, as long as you eat out in the food court. Most likely they will ask you to throw it away, or go to the food court and eat
I don't think that's officially allowed, but if you get in with them (say, hidden), then I don't think there is a high chance that they will ask you to get rid of them.
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