(Las Vegas, NV) — Las Vegas’ tourism numbers continue to rise. The Convention and Visitors Authority says nearly three-and-a-half-million people came to Sin City in July, an increase of more than four percent from a year ago. It was also the 17th straight month of tourism gains. Also going up is room rates, which averaged 99-dollars in July. But convention attendance fell 18 percent from July 2010’s numbers.