Osage Casino & Hotel Tulsa opening Summer 2018! Osage Casino Tulsa boasts over 16,000 square feet of banquet space. Whether your event is small or large, we deliver exceptional service, every time. We offer superior amenities, including on-site catering and multimedia equipment, creating an effortless meeting or banquet. When it comes to entertainment, remember the advantage Osage Casino offers – fantastic gaming for all your guests to enjoy! Let us help you plan your banquet!