there are two options to fix this sentence. what is the calendar for the season. as in what will happen in this season. alternatively, what season is it on the calendar. that is - to look at the calendar and find out what season it is.
This translation makes no sense. Do you mean 'What season is this?' It is possible to say 'a calendar year' as in 'The calendar year is the period between January 1 and December 31.' 'Calendar season' would never be used.