It is a double-header in Pasadena: the Alien Con is at the Convention Center and across the street dozens and dozens of chalk artists are creating works on the Plaza at Paseo Colorado. And it was very crowded on Saturday!
I went at noon on Saturday and most of the artists were just beginning. First they drew an outline of the picture they planned to create, then painstakingly started to fill in with removable paint and chalk. It all gets power-washed off the plaza on Tuesday. Here is some of what I saw in 2018.