Answer : it's the European Space Expo. Why ? Just let us explain !
Little riddle: what is the relation between 50.694, 364.228 and 23.781 ?
The European Space Expo just finished its 2013 tour by a last stopover in Lisbon, after visits to Copenhagen, Toulouse, Helsinki, Brussels, Vienna, Larnaca (Cyprus), London, Madrid, Budapest, Hannover, Warsaw, Bratislava, Dublin, Rome, Vilnius, Tallinn and Munich.
During the emotion-rich event in Lisbon, exactly 50.694 visitors visited the "dome", making the global total of visitors to the Expo an impressing 364.228 !
Lisbon was the second best result in terms of attendance, directly after the Rome's edition.
23.781 is the total amount of kilometers run by the trucks ensuring the logistics of the Expo.
Isn't all of this an impressive success, highlighting how the European Space-based Activities are fascinating ?
And we have a last good news for you : in 2014, the European Space Expo should be on the road again. Details to follow !