I have a US Army friend and he had a military exercise a few months ago. I texted him
Are you exercising tonight?
during exercise period. I learnt that present continuous can be used for future tense. for example
We are having a party at my house on Halloween
This is why I used present continuous in the sentence. However, I read a grammar book again and it said I should use present tense when plans are fixed like a timetable.
I guess a military exercise is a fixed plan. Should I have texted him
Do you have an exercise tonight?
using present tense instead of present continuous?
Are you having an exercise tonight?
also wrong in that situation?