Clark County Event Center SW Washington's premier event destination. Located just 20 minutes north of downtown Portland (adjacent to Interstate 5) and within an hour's driving distance of more than 2.5 million people, the Clark County Event Center gives unmatched flexibility for all types of shows. Our year round facility features 97,200 sq. ft. column free exhibit space, as well as several multi-use buildings an indoor Equestrian Arena and an outdoor Grandstand.