I do the same thing
I call mine "1Upcoming Events". In Lotus Notes, I can very quickly move an email from my inbox to this folder using keystrokes. I put the "1" in front so I can hit a single key to select the folder from the dropdown list. Reviewing and tidying up this folder is part of my weekly review checklist, along with review/preview calendar.
I do the same thing with "2Waiting For" and "3Promises" folders. Promises are things that are relatively quick to do, but that I'm not likely to get to on the day. When I email my promised timeline, I save it to this folder. I review the folder every morning as I'm setting my priorities for the day.
Works a treat.