How do you outdo all the attention-getting events at a festival designed to grab you at every turn? SeriesFest: Season 4, which returns for its (surprise, surprise) fourth annual outing June 22-27 in Denver, has an idea, and it involves Red Rocks Amphitheatre, a multiplatinum country band, and thousands of people watching a new, big-budget Kevin Costner project. SeriesFest has long been described by organizers as “the Sundance for TV,” and that certainly gets at the industry-focused programming, which is designed to encourage deal-making among creatives and television executives who travel to Denver from Los Angeles and elsewhere. From the digital revolution to diversity issues, sci-fi to comedy and drama, there are plenty of shows and topics on the docket this year.