"What is the calendar of the season?"
Translation:Qual é o calendário da temporada?
Whenever you have a limited number of options, you must use 'qual' (which) instead of 'o que' (what). For example, in English, you should technically say "Which is your favorite flavor?" In Portuguese, however, it is grammatically incorrect to not do this. You only use 'what' when there are an unlimited number of options like "What do you think of ice cream?"