I now work for a very large hotel chain that participates in the entertainment card program. Booking is simple, just buy the entertainment book anytime before your trip, and call the hotel and let them know you have the card. If there are rooms available at that rate they'll let you have one (usually hotels set aside a set amount of rooms for each special rate; say maybe 20 rooms per night for entertainment rate). Just make sure to call early and you shouldn't have a problem getting the entertainment rate.
Jim
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