Buy a small diary- help you to remember important dates for things.

Diary  (d-r)

n. pl. di·a·ries

1. A daily record, especially a personal record of events, experiences, and observations; a journal.

2. A book for use in keeping a personal record, as of experiences.

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[Latin dirium, daily allowance, daily journal, from dis, day; see dyeu- in Indo-European roots.]

http://www.thefreedictionary.com/diary

I like these leather ones, especially the tree.I think I would benefit from a diary as my brain goes to mush when I try to remember what dates I have things on argh.