A screening of Netflix’s “ Lord of the Flies ,” an innovation talk with NBCUniversal Entertainment chief business officer Liz Jenkins and a panel with writers from NBC dramas are among the additional programming SeriesFest has unveiled for its 12th season. The festival will take place from May 6 through 10 at Sie FilmCenter in Denver.  Newly announced programming also includes a screening and Q&A for the drama series “ Spartacus: House of Ashur ”; a sneak peek at “ Little House on the Prairie ”