The inflatable obstacle course, with its rocket ship, is a popular attraction as part of Mars Encounters at the Clark County Fair. Photo by Paul Valencia🎧 Mars Encounters Lands at the Clark County Fair Your browser does not support the audio element. From the creator of past fair exhibitions Dino Encounters and Ice Age Encounters, this year the Clark County Fair is proud to present Mars Encounters. Photo by Paul ValenciaIn DeWitt’s fictional world of Mars Encounters, Mars has that resource in its rocks. They were enjoying their time with Mars Encounters, the featured exhibition for families at the Clark County Fair.