Booth Theatre, New York Stranger Things star Sadie Sink takes the lead in a wonderfully written new Broadway show about high schoolers grappling with hot potato issues in 2018 Soaring prices be damned, Broadway may nonetheless be experiencing some kind of youthquake. Following on the heels of a successful Rachel Zegler-led revival of Romeo and Juliet, which supposedly broke records for the greatest share of under-25 …