Then , we celebrate the 25-year journey of amazing “ all in ” experiences at Mohegan Sun . There are countless incredible memories to be shared . If that ’ s not enough , Miss America also grabs the spotlight for their 100th anniversary . Finally , one of Mohegan Sun ’ s sister properties , ilani , which is the most spectacular travel destination in the Pacific Northwest , celebrates 5 years , reaching a major milestone in the construction of their new hotel .