For performances where you won't have more than a few dozen or hundred guests, check out music academies,
dance studios, universities, and other centers for the arts. These organizations all have performance halls that vary in seating arrangements and amenities included. Some offer just the essentials, like a stage, window lighting, and an open floor plan for seating. These are ideal for auditions and rehearsals where you don't need to have everything you'd want for the final show.
Other performance halls have stage curtains, soundproof walls, and professional lighting installed in the floors or ceilings. These spaces are perfect for final rehearsals and the performance itself.