Houseguest Raven Walton to compete on this season of BIG BROTHER. CBS\’ summer reality hit begins with a two-night premiere event on Wednesday, June 28 (8:00-10:00 PM, ET/PT), and one hour on Thursday, June 29 (9:00-10:00 PM, ET/PT), on the CBS Television Network. Julie Chen returns as the host of the hit summer series. Photo: Cliff Lipson/CBS é2017 CBS Broadcasting, Inc. All Rights Reserved