5,000 bonus points are offered - any night during a specifc period, BUT when a reservation is for a Friday night, those bonus points are not available. No black out dates are posted. If my business operated like that, the Attorney General would go after my license.
spfy123 has correctly deduced that apparently for this offer, Fridays are indeed "blackout dates".
Terms & Conditions:
Offer applies to one regular room per stay, per member on dates listed. A "hotel stay" or "stay" means all consecutive nights spent with Marriott by a registered Marriott Rewards member. Offer not available during special events; tax is additional; special offers cannot be combined; blackout dates may exist; advance reservations are required. Offer does not apply to groups of 10 or more rooms.