Crocus Сity Hall in the Moscow region,, is a plush concert venue where former US president Donald Trump once held a "Miss Universe" contest.
It is a short walk from a Moscow Metro station and just next to Moscow city ring road, although formally it is outside the city limits.
The complex which also includes a shopping centre and conference centre holds events such as car shows.
The relatively intimate concert venue has attracted a range of Russian and international stars.
British comedian-turned-politician Eddie Izzard performed a solo show in English there in 2013.
Piknik, who were set to perform on Friday, are a popular rock group dating back to the Soviet era.
The venue was built by real estate developer Aras Agalarov, who is extremely well-known and influential in Russia and has links to Trump.
Agalarov, 68, was born in Azerbaijan but is a Russian citizen.
He was listed as worth $1.2 billion by Forbes in 2021. His company Crocus Group specialises in luxury retail and leisure developments.
Forbes Russia reported last week that Agalarov and his business partner and son, Emin Agalarov, had taken out personal loans to save the business, however.
The father and son came to the scene of the attack and fire on Friday night, Russian news agencies reported.
Gunmen opened fire at the Crocus concert hall in Moscow leaving dozens dead and scores wounded before a major fire spread through the building. Source: Getty / Stringer/AFP
The Crocus City Hall venue opened in 2009 and was dedicated to Muslim Magomayev, a pop singer famous in the Soviet era who also came from Azerbaijan.
US entrepreneur Trump held the Miss Universe beauty contest there in 2013, telling media he had invited President Vladimir Putin, who did not show up.
Emin Agalarov (left) with Donald Trump and Aras Agalarov at a press conference before the final show of the 2013 Miss Universe pageant in Moscow. Source: EPA / Sergei Ilnitsky
Emin Agalarov in June 2016 arranged for Donald Trump Jr, Trump's son-in-law Jared Kushner and campaign chair Paul Manafort to meet a Russian lawyer, Natalia Veselnitskaya, who had offered damaging information on Clinton.
Agalarov told Britain's The Daily Mail that the meeting, which he helped set up at his father's request, was "unproductive and useless", however.
