The National Theatre was founded in the latter half of the 19th century. It is located on Republic Square, in Belgrade, Serbia.
The National Theatre was declared a Monument of Culture of Great Importance in 1983, and it is protected by the Republic of Serbia.
The National Theatre Belgrade was built in 1869 according to the design of Aleksandar Bugarski, the most productive architect of Belgrade in the 19th century. The decision to construct a special building for the theatre was made by Knez Mihailo Obrenović.
During one of the toughest times in Serbian history, which is the 1999 NATO bombing, this theatre was the only one to open its doors to the public during the 78-day air raids. For only 1 dinar, opera, plays and ballets were performed to the public. The performance times were very unusual, from 15:00 to 18:00. It was done because in that period of time there were not NATO air strikes on Belgrade. World well-known opera conductor, maestro Alberto Zedda, said once that during those horrible days Belgrade Opera was proudly writing the most dignified pages of history of world opera.
Make sure you are looking on the panel with list of the performances (the one with english version). But don't look just at the panel.
You may need some hook/stick to get it out if its too tought to get. Inspect and decide.