Join the street team at Su Teatro! When we are not enjoying the best of Den-Mex food, we will be handing out swag and shooting photos. Gustavo Arellano isn't just the man behind Ask a Mexican!, his weekly column in Westword. He's also the author of Taco USA: How Mexican Food Conquered America, and in that book he lavishes praise on the Mexican food of Denver. The party starts at 6 p.m. Wednesday, May 30, when Arellano will return to Su Teatro to talk about his book and sell and sign copies.