Tercüme - Türkçe-İngilizce - canim gekmiceksen haber ver? unutalim

"Let's forget it." What does that "it" mean?

It actually says "let's forget.". I guess they planned to do sth, and if s/he doesn't come, -for sure- they wont do it, I wanted to express "their plan" with saying "it". just guessing again.

...if you will not come..