It is used to refer to a scheduled or regular event.
simple present
They are going to visit/will visit their grandparents during the holiday break.
are going to
The chef prepared a delicious meal.
A delicious meal was prepared by the chef.
Several houses were damaged by the storm.
The storm damaged several houses.
It is used to talk about an arrangement made with other people.
present continuous
We might attend/will attend the theater workshop, but we’re not sure yet.
might attend
The company launched a new product last month.
A new product was launched last month by the company.
The proposal has been being reviewed by the committee for several weeks.
The committee has been reviewing the proposal for several weeks.
It is used for decisions made at the moment of speaking.
will
The restaurant will open/ opens at 7:30 am.
opens
The teacher explained the lesson clearly.
The lesson was explained clearly by the teacher.
The findings will be published in a scientific journal by the researchers.
The researchers will publish their findings in a scientific journal.
Do you finish work at 7:00pm? I will/am going to pick you up.
will
The company normally delivers cars within a month.
Cars are normally delivered by the company within a month.
Her latest book is going to be released by the author next month.
The author is going to release her latest book next month.
The researchers will publish their findings in a scientific journal.
The findings will be published in a scientific journal by the researchers.
An interesting article was written by the journalist.
The journalist wrote an interesting article.