Dan Cameron treated the last few days in July like he was training for the Olympics. He found time for the gym. He tried to get to bed on time. He ate his veggies. All of this in preparation for Open Spaces KC, a brand new cultural event that will take place over nine weeks in several usual and not-so-usual arts destinations in the city. “There are going to be lots of surprises between now and Oct. 28,” the artistic director of Open Spaces said the other day.