Filmmaker Jessica Hall’s sister Katherine manages her intellectual disability by leading an independent, creative, and joyful life. Every Saturday, Katherine and her mother, Frances, share a cherished routine: thrifting, browsing the hardware store and working side by side on their intricate miniature-house projects. Saturday documents their story, blending present-day moments with intimate home movies that trace their immigration journey and family history. With warmth, creativity and quiet resilience, the film celebrates Katherine’s independence and the powerful bond between mother and daughter.