It'll almost certainly be an "all ticket" fixture due to the size of the ground, competition and TV element. The only issue "carnage" wise is the lack of home/away fan segregation. It'll be interesting to see how that's handled as a friend said it could've turned nasty against Barrow if their fans were so inclined.
Mansfield fans will be at their game before most of Birmingham will have arrived and set off home long before our game is over. Even if both were 3 of clock nothing would have kicked off. Plenty of space between the two grounds for fans to not have to come into contact with eachother.