Part spoken-word performance, part concert, part postmodern portrait of the making of a one-man show, Arinzé Kene’s “Misty” comes to the Shed, starting previews on March 3. As a Black Briton moving around London’s transit system, the actor-playwright-rhapsode found inspiration in the idea of people as a virus; accompanied musically by Adrian McLeod and Shiloh Coke (and sometimes challenged by them), Kene explores ways that overfamiliar constructs of Blackness infect his artistic expression, and the contagious impacts of gentrification.