[Sasuke]

Being this forum so useful to clarify all my doubts I have another couple of them since a bit of time.

The first one is regarding future in time clauses; for give an example:

• Call me when you will have finished.
  or
• Call me when you have finished.
  
• I would like to know when the game will be released.
  or
• I would like to know when the game is released.

I haven't completely understood how to use the future in these clauses yet. I think that the first two are correct but in my opinion the others sound better, expecially the second one.

About my second question... if I want to say that I can't not do a thing how should I do?
Is this sentence correct?

I promised him that I would go to his party so I cannot not go.

Thanks!