 Complete the following phrase:  The stadium was established in 1958 by Russian construction in Ulaanbaatar, Mongolia. Since then, it has not been majorly renovated, although it gets a little painting and touch up once a year. Even though the stadium was built for multi-use such as football and festivals, the only mandatory event is the Naadam festival held on July 11 of each year which commemorates Mongolian State Flag Day and the 