German phrase
Wann ist es zu ~ am vollsten?
Meaning
When is it most crowded around ___?
When to use it
Asks when it is most crowded. It is common when planning travel around events.
Example dialogue
Wann ist es zu Weihnachten am vollsten?
When is it most crowded around Christmas?
Meistens am 24. und 25. Dezember.
Usually on December 24 and 25.