T&C first leaked:

The Big Night Giveaway Promotion ("Promotion") is available only to Club Carlson members. To be eligible for the Promotion, members must register online for the Promotion at http://www.radissonbignightgiveaway.com ("Promotion Registration"), provide their Club Carlson member number at the time of reservation or check-in of the Qualifying Stay, and then complete one Qualifying Stay at any Radisson or Radisson Blu hotel worldwide ("Participating Hotels"). Guest must check in for the Qualifying Stay on or after May 15, 2012 and check out must be completed no later than July 15, 2012 ("Promotion Period"). A "Qualifying Stay" is defined as a stay of one or more consecutive nights in the same room at a Participating Hotel regardless of the number of check-ins or check-outs on a rate for which Gold Points are awarded in accordance with the Club Carlson Program Terms and Conditions.

Guest must be present at the Participating Hotel at both the time of check-in and check-out, enrolled in Club Carlson at or before the time of check-in, and registered in the Promotion no later than the time of check-out (to enroll in Club Carlson, visit www.clubcarlson.com). The first 100,000 guests who complete the Promotion Registration will receive 50,000 Bonus Gold Points after the completion of their Qualifying Stay. After the first 100,000 Promotion Registrations, every guest who completes the Promotion Registration will receive 15,000 Bonus Gold Points after the completion of his/her Qualifying Stay. These Bonus Gold Points are in addition to the standard Gold Points awarded for a stay. Only one Club Carlson account per Qualifying Stay will be credited with the Bonus Gold Points.

Maximum of one Bonus Gold Point award will be credited to a member with a Qualifying Stay under the Promotion regardless of the number of Qualifying Stays completed by the member during the Promotion Period. Allow 6-8 weeks for the Bonus Gold Points to post to the member's account. The Promotion and Gold Points are subject to all Club Carlson Program Terms and Conditions. Rates for each night of a Qualifying Stay may vary. Promotion is not valid on existing reservations and is subject to availability...