The official opening ceremony will be attended by Lithuanian Foreign Minister Linas Linkevičius, Vilnius Mayor Remigijus Šimašius, Vladimir Kara-Murza, chairman of the Boris Nemtsov Foundation for Freedom, Boris Vishnevskiy, a Saint Petersburg's councilor, and Alexey Venediktov, editor-in-chief of the Echo Moskvy radio station.
Nemtsov's daughter Zhanna Nemtsova also plans to attend the opening ceremony.
Vilnius is set to become a second city in the world where the memory of Nemtsov is honored after a strip of Wisconsin Avenue near the Russian Embassy in Washington was named after the late Russian opposition figure in late February.
"I think it’s a huge sign of respect for democracy, for people fighting for freedom, for that part of Russia which finds these common human and Western values acceptable," Vilnius Mayor Remigijus Šimašius told BNS Lithuania.
A small square in Žvėrynas area of Vilnius outside the Russian Embassy was named after Nemtsov in May, causing Russia's dissatisfaction. Russian Ambassador to Lithuanian Alexander Udaltsov then called the decision by Vilnius politicians "aping", following in the steps of Washington.
Nemtsov was shot dead on Feb. 27, 2015 in Moscow near the Kremlin. He visited Lithuania several times and was one of the most active supporters of Lithuanian during the January 13 events and later.