If that is a reference to my post its only fair to record the process of getting people on trains was smooth. I just nearly came a cropper due to a combination of an early last connection and not being allowed on the train I had booked, which was one of the later ones anyway.
There will be a lot of passenger assistants around tomorrow if you have concerns just check on arrival whether specified train tickets will be valid, if not factor that into your arrival time at the station.
Millennium Stadium is a regular host to big events. I suspect they will be on top of it now.