Pina Bausch’s dance theater, Jerzy Grotowski’s poor theater, and Anton Chekhov’s dramaturgy of banality converge in a rehearsal. The camera also plays the role of an unexpected guest at this peculiar feast. The excesses of Samantha Shay’s play “I Should Have a Party for All the Thoughts I Didn’t Say” overflow with solitary afflictions. Yet, within the repetition of the gestures, glimpses of shared anguish emerge. Dance, dance, dance: after all, we are already lost. (Juliana Gusman)