The doors are open for Prince’s “Rally 4 Peace” charity concert in Baltimore, Md., but don’t you dare take a picture inside the arena with your phone:

Although we shall see if they enforce it:

You can watch at home here:

Exit question: Will the arena use police officers to throw out those in violation of this policy?

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Related:

How many armed guards will protect Prince at Baltimore Rally 4 Peace?

Editor’s note: This post has been updated to correct a grammatical error in the final sentence.