If I have something that I don't want to review now but want to look at say in December (by December 5th for example) can I put that on my calendar to review on say december 4th? or a reminder on Nov 30th that the deadline for review is coming up? I know that the calendar should have hard edges of only what needs to be done at a specific time or day. I don't want to use a physical tickler file I prefer to use a digital format. Should I use another calendar for these sort of things rather than my actual hard edges calendar?