The dev will be dumping event crates over the course of the event

Throwback Stadium's goals are arranged a bit differently, again hinting at the Battle Cars type of layout. Moreover, Psyonix made sure that ball physics on this stadium mimics that of Battle Cars, meaning you should expect the ball to be a bit lighter.

The dev will be dumping event crates over the course of the event, instead opting for anniversary themed balloons. You earn balloons by playing online matches and you can redeem them for anniversary surprises - Golden Eggs. No keys or decryptors are needed to crack them open, with one of 60 customization items from the now-gone Champions Series Crates waiting inside https://www.lolga.com .

Note that the balloons will only be around during the event and Psyonix warned users that there will be no one week redemption grace period. Golden Egg items can be traded for others from its own series, but not with crate items.