The ESL One Cologne 2017 is the biggest LAN event ongoing right now. There are several players from various teams. The teams are given areas to practice before their actual matches on LAN. The format for the team is the Swiss system in the Group stages. As a result, there is a lot of shifting of teams happening all the time.
A photo posted by Hazed points out to the litter caused by players. This is definitely not keeping in mind, the cleanliness for the next team that will play on the same stations.