In 20 years, the students gathered in the cafeteria of Westland Middle School on Saturday might be watching the first humans land on Mars as they huddle around their flat screen monitors. Or better yet, one of them might be stepping out of a spacecraft onto the red planet itself. For now, it’s the stuff of daydreams and science fiction novels, but the elementary and middle school students who attended the FIRST LEGO League tournament in Corvallis are already making plans to visit Mars. Teams from across the state gathered at Westland to compete in a robotics event that combines computer programming with LEGO know-how, in a Mars-themed event.