Context: From April 20–23, 1989, pre-election meetings were held in Lviv for four consecutive days, drawing crowds of up to 25,000. The action included an one-hour warning strike at eight local factories and institutions. It was the first labor strike in Lviv since 1944. On May 3, a pre-election rally attracted 30,000 in Lviv. On May 7, The Memorial Society organized a mass meeting at Bykivnia, site of a mass grave of Ukrainian and Polish victims of Stalinist terror. After a march from Kiev to the site, a memorial service was staged.

Question: How many people attended the Lviv pre-election meetings?
Answer: 25,000

Question: How long did the warning strike last?
Answer: one-hour

Question: Where did the strike take place?
Answer: eight local factories and institutions

Question: Prior to the warning strike when was the last labor strike in Lviv?
Answer: 1944

Question: At what sight was the Bykivnia meeting held?
Answer: mass grave