Large, with enormous walking distances between dif...

Large, with enormous walking distances between different halls, halls, theaters and presentation rooms. That keeps you fit during a 2-day IT conference.
A number of rooms were excellent (Auditorium, Forum), but Hall 11, for example, was huge, dark and atmospheric. There may be better lighting.
At the floor of the halls for the sponsors, something must be done as well. That does not really look like that anymore.
The welcome and guidance of the many 1000 -one guests was fine.