Student or Learner
On my book is written that we do not use will for things we have already arranged or decided to do like " We are going to the cinema on Saturday" or "I'm not working tomorrow". So why can we say "We will probably go out this evening" or " You can call me this evening. I'll be at home" if both examples are planned ?
So can i also say "You can call me this evening. I'm going to be at home" ?