What are the dates of ceremony at music festivals corresponding to volumes that lasted more than 2 weeks on top?
SELECT T1.Date_of_ceremony FROM music_festival AS T1 JOIN volume AS T2 ON T1.Volume  =  T2.Volume_ID WHERE T2.Weeks_on_Top  >  2
SELECT T1.Date_of_ceremony FROM music_festival AS T1 JOIN volume AS T2 ON T1.Volume  =  T2.Volume_ID WHERE T2.Weeks_on_Top  >  2
[{'Date_of_ceremony': '18 February 2011'}, {'Date_of_ceremony': '18 February 2011'}]