why is "god konsert" wrong here? why "bra"?
Historically, god was used more like in English, but today, it's normally only used to mean a) morally good (opposite of evil) b) tasty.
There are some set expressions where god still means just 'good', but this is not one of them.
Can det blev not be used here?
That would mean that it ’became’ or ’turned into’ a good concert.
It is a silent t on the end of konsert?
Exactly! Also, the stress is on e.
Is there a rule or a logic when loanwords from other languages keep there 'c' and when they turned into 'k'?