Hannah Gadsby is a headlining comedian in Australia, a regular at the Edinburgh Fringe Festival, and is about to become a very big deal in America with a special on Netflix called “Nanette.”  It’s a full-length comedy show, and at the same time, a carefully structured critique of stand-up comedy. “Nanette” reflects her experiences as an overweight woman, a lesbian, a native of Tasmania, and an adult diagnosed with autism, and addresses subjects as serious as Gadsby’s sexual assault..  She tells The New Yorker’s Emily Nussbaum that comedy contains a kind of violence, and she might be done with it.  Plus: Amanda Petrusich picks three outdoor music festivals worth sweating for.