I have this sentence: "I don't remember mentioning ______ dinner together tonight.

Why the correct is "going for" and not "go for"?

AnonymousWhy is the correct form is "going for" and not "go for"?
"mention" takes an -ing form.

to mention going, to mention seeing something, to mention finding something.

He was mentioning doing that.

"remember" also takes an -ing form.

to remember going, to remember mentioning something, to remember seeing something.

I didn't remember doing that.

Remember can also be followed by the to--infinitive, meaning a future or subsequent action:

Remember to lock the door and turn off the lights when you leave,
He didn't remember to shut the window, and the curtains got soaked with rain.