Nemesis
SERIOUSLY!
So double that number with folks standing squished together like sardines. 100 per carriage? 1,200 per train? So 10% of a 12k crowd per train. So with the three main trains only being realistic, that's 30% are "shiftable" by train. So the other 70% will need to be serviced by Buses, Coaches, Parking at Sussex Uni (how much parking is possible there? and how will they regulate it?)
I realise these are crazily rough figures, but at least it gives some idea??
There should be a fair number traveling in the opposite direction-Lewes, Eastbourne,etc. Nowhere near as many as going back to Brighton, Shoreham, Worthing but nonetheless there should be a fair few...