Time block it!

If you don't time block it or put it in your calendar, it'll probably be forgotten.

That's what happened to me.

Said I'll do something. 

Clean forgotten about it.

Only now do I remember because I looked at my calendar and I have set an appointment with this person.

And there's something I need to do.

Taking time now to go and get it done.

To me: Time block it. 

Put it in your calendar!