With an event like DreamHack it takes more time to build up the whole event than the actual duration of the event. So five days before DreamHack actually starts they already start with building up the tables, the network and everything else that makes up DreamHack. Thanks to Twitter we already have the first images of the build-up!
If you are wondering what all these pallets are for? They make up the 9200+ seats that DreamHack has ;)! And just about everything else is also made from these things!