A schedule of Grand Casino Mille Lacs poker tournaments, including time, buy-in , blind structure, and more. You also can find Grand Casino Mille Lacs phone. Looking for live action poker? The River's Edge Poker room in the Grand Casino, located in Onamia, Minnesota, is the place to go. Enjoy your favorite poker. The Grand Casino company runs two casinos in Minnesota, both north of Minneapolis. One is in Mille Lacs, the other is in Hinckley; they both.