After more than two years of construction, Nashville will celebrate the grand opening of its $585 million Music City Centeron May 19 and 20, with more than 100 meetings already on the books. The highlights of this 2.1 million-square-foot facility are the 57,500-square-foot Grand Ballroom, which seats 6,000 people, and the 353,143-square-foot exhibit hall. However, more intimate groups can book the 17,900-square-foot junior ballroom or any of 60 meeting rooms. An 800-room headquarters hotel, the Omni Nashville, will open in the fall.