Mixed in with the books and other more traditional items at Maple Valley Library and Covington Library are video games for teenagers to play during Game On days. The next one at the Maple Valley branch is tomorrow at 4 p.m.; for the Covington branch, the events are at 4 p.m. on Wednesdays. As library officials say, “just show up” and play “GameCube,” “Xbox 360,” “PS2” and “Wii.” That’s what the teens in these photos did in Maple Valley.