I am learning about the different tenses that we can use to express the future and in my book it says that:

- present continuous to express arrangements made before the moment of speaking: ex. Are they installing the new computers next week?

- present simple for timetables, arrangements and fixed events (which the speaker cannot change): ex. the bus to the science museum leaves at 8 o'clock tomorrow morning.

My question is for he following sentence:

We ................................ a press conference about our new discovery on Tuesday.

Is it correct to put either "hold" or "are holding" because it is an arrangement.

Thank you for your help