Questions & Answers about Når alt er på plass, kan vi begynne møtet.
Here Når means when in a general or future-looking sense: When everything is in place, we can start the meeting.
A useful rule is:
- når = when, for something habitual, general, or in the future
- da = when, for a specific event in the past
So in this sentence, Når is used because the sentence is about a condition or point in time that has not happened yet.
Alt means everything here.
Norwegian distinguishes between:
- alt = everything / all of it
- alle = all (people or countable things in a group)
So:
- Alt er på plass = Everything is in place
- Alle er på plass = Everyone is here / in place
In your sentence, the meaning is everything, not everyone, so alt is correct.