It occurred to me that most of the concerts linked to an album start with the first track from that album:
La Concorde, linked to the Equinoxe album: Equinoxe 1
China (at least on the album), linked to Magnetic Fields: Overture, which is a slowed down Magnetic Fields 1
Houston: this is an odd one, since Rendez-Vous was the obvious album it was linked to, but the album was not out when the concert was in preparation. So Zoolook is the last released album. First track: Ethnicolor
Docklands, linked to Revolutions: Industrial Revolutions
La Defense: here this rule doesn't work, it's linked to Waiting for Cousteau.
Europe in Concert: Chronologie 1
Oxygene 7-13 tour: Oxygene 7
12 Dreams of the Sun: doesn't work either: Bells was the opening track and not Je Me Souviens (which was the 2nd track though). And Metamorphoses wasn't even out yet.
Oxygene anniversary tour: Oxygene 1 was preceded by an overture track... Which counts as an official track. That same overture track is on the Live in Your Livingroom DVD.
Electronica Tour: (Electronica 2 was the last album out): The Heart of Noise.