Since then Las Vegas visitor traffic has recovered to new record highs.
Visitor traffic was 2.9% above the record set in 2014 and 8% above the pre-recession peak.
And convention attendance is returning. Here is the data from the Las Vegas Convention and Visitors Authority.
The blue bars are annual visitor traffic (left scale), and the red line is convention attendance (right scale).
Convention traffic was up 14.0% in 2015 compared to 2014, but was still 6.6% below the pre-recession peak set in 2006.
It seemed like there were many housing related conventions during the housing bubble, so it has taken some time for convention attendance to recover.