Up to 5,000 people are expected in Salt Lake City from Aug. 10 to Aug. 15 for the 2009 convention of Scentsy Inc., a Boise, Idaho-based company that sells wickless wax scent bars. With conventioneers filling 4,500 room nights in area hotels, the meeting is projected to generate $4.5 million for Salt Lake County's economy, said Todd J. Ness, who booked the sale for the Salt Lake Convention and Visitors Bureau.