At a band rehearsal in Brooklyn, Rachel Syme talks to Maya Hawke about switching gears between acting and music. In “StrangerThings,” Hawke plays Robin Buckley, a band geek who cracks a Russian code in her spare time; she also recently appeared in films including “Asteroid City” and “Maestro.” “When I’m acting, I inhabit the character that I’m playing,” Hawke says, whereas when fronting a band, “I feel like I’m me… But sometimes I have to screw my courage to the sticking place, and that’s a bit of a character. It’s me, [but] willing to stand up onstage.” Hawke discusses the inspiration for her single “Missing Out”: a visit to her brother at college, where she came to terms with some of her own choices. Plus, the playwright and novelist Jen Silverman, whose new book “There’s Going to Be Trouble” deals with the excitement and uncertainty of getting caught up in a protest.