“We followed all the protocols”, says president Bas Radder of the Navigators Student Association Rotterdam (NSR). Students who came to the party were required to do a test via Testen voor Toegang and present a negative test result. The association then checked QR codes and IDs at the door.

But it still went wrong. “Someone who had tested negative on Thursday morning still tested positive a day after the party”, says the president. Radder himself had no problems. “And luckily I tested negative too.”

Other events organised by the association are not affected yet. The association is closed for the summer and for a refurbishment of the building.