If memory serves, SASTA shut Falmer station at 10pm for the FBS gig, even tho it was due to finish at 11pm. In theory, the post-match scrum should not have been much worse than for an Albion midweek match, but the scrum would have been made up of one-off visitors who would have been maybe less...
The gig-holding aspect of the Amex does appear to be somewhat underused. Dare say there are some residual LDC-imposed restrictions that the club are still bound by, but, really, these should robustly challenged and kicked into touch. There's a big Summertime marketing opportunity being missed...