This review is part of our coverage of the 2023 Sundance Film Festival. The Pitch: “You need to know that only 3% of people make it. The rest end up in a mental facility — or a Go Go box in Hell’s Kitchen.” Welcome to AdirondACTS, a cozy, scrappy theater camp where such nuggets of wisdom are imparted upon young thespians. Over the course of the summer, we see the minutiae of theater camp play out in a mockumentary-style film, sharply directed by Nick Lieberman and Molly Gordon (both making their feature directorial debuts). First framed as a documentary following AdirondACTS founder Joan (Amy Sedaris), things begin to go awry when she falls into a coma — a result of “the first Bye Bye Birdie-related injury in the history of Passaic County” — leaving former campers, best friends, and devote...