I really cannot see the difference between be going to and present continuous when we speak about future!(
When we speak about future arrengements)

OK, we use to be going to [verb] when we have plans. &nbsp;The main point here is that it is possible to change your plans and nothing is "set in stone", so to speak.&nbsp;When we use to be [verb]ing + future time, this is an arrangement. This means that a set time and place have been decided, and maybe other people are involved in your plans and they know about it. &nbsp;Because it's a commitment, it is not possible to change your plans (not easily, at least).