Questions & Answers about Jouw agenda is op donderdag vol.
Why do we use op before donderdag?
Just like in English ("on"), Dutch uses the preposition op for days of the week. So, "on Thursday" translates directly to op donderdag. Notice that you don't need to add an article like de or het before the day.
Doesn't agenda mean a list of things to discuss at a meeting?
It can, but in everyday Dutch it is a "false friend" to English speakers. An agenda most commonly refers to your personal planner, calendar, or daily schedule. So jouw agenda simply means "your schedule."
Why does vol (full) go at the very end of the sentence?
Dutch has a strong preference for putting time expressions early in the sentence. The time detail (op donderdag) comes right after the verb, which pushes the describing word (vol) to the end. The sentence literally reads as "is on Thursday full."
Could I say je agenda instead of jouw agenda?
Yes, you can! Both mean "your". Jouw is the emphasized form, used here to highlight that it is your schedule that is full (perhaps compared to someone else's schedule). If you don't need that extra emphasis, je agenda works perfectly well.