Concert is in academys 1 2 3 AND 4: What does that mean????

This is probably in completely the wrong place, so I apologise for that, but anyway...

I'm going to be going to a concert: Give it a name [-Incoming-] - 2009 tour at Manchester Academy with Taking Back Sunday, Underoath, Thursday, Escape the fate, Emery, The Academy Is, The King Blues, Innerpartysystem and In This Moment
but it says it is at: Academy 1, 2, 3 & 4.
Does this mean it's three seperate concerts, it changes room part way through, different bands are in different rooms, or what??
Please help!!!
I know you probably wont live near here but I'm sure this stands for lots of venues

Thankyou