Read more Cherokee and Choctaw close all casinos to conserve energy amid killer cold weather Febru-Īs the energy supply ran low in Oklahoma caused by crippling cold weather, all Cherokee Nation temporarily closed ll casinos Tuesday to conserve energy. Guest can make their own mask decision whether or not they have been vaccinated. Masks are now optional for guests at Cherokee Casinos however, casino workers will continue to wear them. News Headlines Masks now optional at Cherokee Casinos.