No you will not be charged. It is free to see the main museum. The special showings on the first floor have a price of admission. There is the Infinity room on the first floor. When you enter turn to the left and walk towards the gift shop there is someone there to sign you up to see the Infinity room. It is also free. Get a parking validation from the front desk for a reduced price in parking..around $15. Nice place.
The Broad is totally free. With reserve tickets like yours, you'll have access to the entire museum. It is totally AWESOME!
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