As usual this kind of thing entirelly depends on the turnout of the event
For example, we design the network so 350 people have 1 network port
if your table has 2 free, you can use them unless another player uses up this slot
So one entry fee guarantees you one network port and power for one machine
If you want to guarantee yourself space for two machines, it is best pay for two
For the laptop, our events have wireless, so you may have some luck there
R4N