Sara Nesson used to revel in hiking adventures, kayaking journeys and long-distance swims. Now a three-minute walk exhausts her. A debilitating illness—chronic fatigue syndrome—forced her to turn to different sources of joy and creativity: theater and visual art. Now she’s committed herself to bringing visibility and equity to other artists living with disabilities. A longtime Marin County resident, Ms. Nesson will share her story during a virtual one-woman show, “The Broken Mishkan,” sponsored by the…