What is the name of the stadium which held the most events?
SELECT t1.name FROM stadium AS t1 JOIN event AS t2 ON t1.id  =  t2.stadium_id GROUP BY t2.stadium_id ORDER BY count(*) DESC LIMIT 1
SELECT t1.name FROM stadium AS t1 JOIN event AS t2 ON t1.id  =  t2.stadium_id GROUP BY t2.stadium_id ORDER BY count(*) DESC LIMIT 1
[{'name': 'Yubileyniy Stadium'}]