Not trying to be smart but how or why did you determine you would need 70 machines for the event?
We need power to do this, a modern facility will br best to handle this
There is a convention center up the road, i made enqireies there
They had a sizable foyer, ideal for vendors
The main room was at least 20 x 20 meters
Should be able to fit at least 60 - 70 games,
