KQED Public Media's website has a small section of its Ed Space pages dedicated to short current events-based Do Now activities that teachers can use in their classrooms. These weekly Do Now activities present a current events topic, some background information (both text and video), and a couple of discussion prompts. New Do Now activities are posted on Fridays although it is currently on hiatus until August.
Applications of Education
KQED's Do Now activities aren't terribly in-depth, but they could be good lesson starters. For more in-depth lesson ideas you should explore KQED's curriculum bank where you can search for lessons by subject and grade level.