I hate, hate, HATE, the bottom floating banner. It appears to be related to your ticket liquidators / stub hub ad and possibly from the Chitka ad partner. This ad partner may be including some code that runs the popup ad. (I'm not 100% sure it's their fault, but it only shows up when their ad loads into the top or bottom 728 x 90.
Whoever owns this site should consider removing that ad partner as it's killing your user experience. I also browse this website with my iPad. I know I never contribute, but I visit often. I agree with the other user that this could cause me to not come back with my iPad. That's bad for you because I will continue to use my iPad to browse websites because it's easier than using my desktop/laptop.