FBS also DID have trains before the event and the very nature of the event was that the crowd arrived over quite a long time period.
There also were trains away from the Amex, if people left early, and quite a few did. Beyond that, there was a usual full bus service, as well as the extra buses...
I don't see how it can be played on Boxing Day. I'd not thought about it at all until I listened to Darren Balkham on The Albion Roar last week but no trains to Falmer and no buses completely scuppers it.