Most convention facilities have in-house staff or work with a vendor that specializes in audio/visual equipment. Contact the facility to see what their policies are and what you'll need to bring.
Some facilities may provide some equipment as part of the hall rental, but there is, more likely, going to be an additional charge for any equipment rental.
Also, as Mike mentioned, you may be able to rent the equipment from any decent rental center. It may be cheaper than going through the convention center, but convenience has a price when something goes wrong.
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