Rainbow features two event areas for varying party sizes. Our Rainbow Arena is very reasonably priced and great for receptions or ceremony and reception combinations from 150-500 people. Located outside the main casino building, the Arena features easy access and generous parking. The River Room is our smaller meeting/event room. It is located inside the casino building adjacent to the buffet and is great for showers, rehearsal dinners or small receptions up to as many as 100 people. Go to the website to see many of the in room and out of room amenities.