Marriott International is extending its Meetings Matter promotion, initially launched last year. Planners must book meetings by March 31, 2011, and hold the meetings between now and Sept. 30, 2011. Groups booking at least 50 room nights receive one complimentary guest room for every 35 paid rooms, as well as a 35 percent attrition rate. Groups with at least 100 paid cumulative room nights receive a 2 percent rebate off the master bill. Those registered in the Marriott Rewards loyalty program can receive up to 150,000 total points. The promotion is good at 1,200 participating properties under the JW Marriott, Autograph Collection, Renaissance, Marriott and Courtyard by Marriott brands. More details can be found at meetingsbymarriott.com.