A lot of the attendees missed the first day of PDC. The fires here are soooo bad that they shut down the airport for most of the day yesterday in the southern part of Arnold's state here. Therefore, many of the attendees weren't able to make it in. Some of my publisher friends (1, 2) are stuck right now in Denver and just sitting in the bar at the airport for six hours till they can fly in to the city.
The smoke has caused the city to smell bad but there are some rather nice sunsets!