When I organized a similar event last summer, I rented from a local AV company that was very reliable. For brands, I recommend looking into systems like JBL or QSC, as they offer good quality for both music and voice. Make sure to ask about the wattage needed for your event size, wireless microphone options for flexibility, and check if they provide setup assistance. Also, always test the equipment before the event to avoid any surprises. Are there particular challenges with your event location that might affect the sound setup?