“it will take place” vs “it is taking place” (arranged actions in the future)

I've been trying to find an answer to a question that has been bugging me for quite some time now: If I have to express future in an action already planned and arranged can I use both I will + infinitive and the present continuous? If yes, is there any differences in the use of one form vs the other?

Examples:
1. I'm seeing the doctor at 5 pm vs I will see the doctor at 5 pm.
2. The meeting is taking place on the 5th of June vs The meeting will take place on the 5th of June.

I'm asking this because I was taught that in such instances you MUST use the present continuous while using the will+infinitive form is incorrect (even though I see many instances of the latter on the internet).


You have been taught an incorrect distinction.

All the constructions used for future events—will VERBinf, BE going to VERBinf, BE VERBpr.ppl, will be VERBpr.ppl, BE going to be VERBpr.ppl, BE to VERBinf and even VERBfin—are practically equivalent.

There are no doubt statistical preferences in different situations: BE to VERBinf tends to be used more often with situations involving some sort of obligation, will VERBinf tends to be used more often with earnest promises, VERBfin tends to be used with situations when the speaker is consulting a calendar or engagement book (and with translations of Richelieu’s instructions from The Three Musketeers!), and so forth.

But none of these tendencies rises to the level of a grammatical “rule”.