Thank you for getting it and asking about my colour coding.
Red = essential work meetings
Orange = non-essential work mettings
Blue = Generic or regular things that are happening (e.g. dog needs flea treatment, monthly market happening today)
Green = Irregular things that are happening (e.g. opticians appointment, book club, someone coming to visit). Exciting things get a cloud surround with some extra decoration too.
Pale pink = Reminder to pay stuff
Light green = Information about me that I may/not need to know or be monitoring (namely weight)
Yellow = Used to note the cost of that day's train tickets so I can add up the total each month and also know which days I've actually booked already.
All the colours together and with stickers and glitter and other such things = Annual leave
All coloured pens are scented of course.
I'm a very senior, very professional woman in my late-30s.