Hello !
The "sign in " was to late .We must check if there will become some free space.As visitors you can come (...you are welcome...) .But if the car`s can still go on the ground ( the place ), we must wait.At the moment it is full.
Greetings, the Organisation Team.
Sorry, my English is not that good, but this is more or less, what they want to tell you .
Ciao
Andreas 😎