Read this: On October 1, 1989, a peaceful demonstration of 10,000 to 15,000 people was violently dispersed by the militia in front of Lviv's Druzhba Stadium, where a concert celebrating the Soviet "reunification" of Ukrainian lands was being held. On October 10, Ivano-Frankivsk was the site of a pre-election protest attended by 30,000 people. On October 15, several thousand people gathered in Chervonohrad, Chernivtsi, Rivne, and Zhytomyr; 500 in Dnipropetrovsk; and 30,000 in Lviv to protest the election law. On October 20, faithful and clergy of the Ukrainian Autocephalous Orthodox Church participated in a synod in Lviv, the first since its forced liquidation in the 1930s.

What was happening in the stadium at the time?
What is the answer? (If it cannot be answered, return "unanswerable")
concert