50,000 attended the Boardmasters festival in the UK, and 5,000 caught Covid-19.

The festival required proof of vaccination or a negative Covid test, but no other precautions against transmission. The photo shows that people were packed close together.

This shows that vaccination verification alone does not ensure people's safety. Other precautions are still needed. Vaccination verification can make it possible to hold events and open venues which otherwise would have to be kept shut, but they do need masks and physical distancing,

Also, since people under 12 cannot be vaccinated, perhaps this must be limited to places and events where few children will go. Those that attract children may still have to be shut.