When in use as a concert arena: about 71.000 people can enjoy the show.
Building cost: € 140.000.000,- (140 million Euro's)
Fun fact: At an angle of 37°, the stands of the ArenA are the fourth steepest in Europe!
In 1996 I was working as a busdriver on the Schiphol Airport apron doing passenger (and sometimes crew) transfers and I saw Michael Jackson arrive at the freight area.
A bit later I went to the concert where the military tank(!) entered the stage. (See the YouTube clip below!)
List of artists having performed in the Amsterdam Arena:
https://en.wikipedia.org/wiki/Johan_Cru ... sic_events
Football (soccer) 'stats':
https://en.wikipedia.org/wiki/Johan_Cru ... n_football
[More information]
https://en.wikipedia.org/wiki/Johan_Cruyff_Arena (in English)
https://nl.wikipedia.org/wiki/Johan_Cruijff_ArenA (in Dutch)

Closed roof

Opened roof
[YouTube]
Direct link to exact time: https://www.youtube.com/watch?v=uYixZ__ZrMU&t=6016s
And a close up of the scene in the Bucharest version:
Direct link to exact time: https://www.youtube.com/watch?v=pdKsg5d6UGM&t=6870s