any great suggestions for scheduling writing assignments?

I am trying to come up with a good a way to enter writing assignments on the organizer.  I haven’t found it yet!  I’d love some ideas.  For example, in any given week, my kids will each complete a variety of writing assignments related to our history studies, or their literature books, etc.  The type of assignment depends on their age.  I don’t want to need to go in and enter every little assignment – and I don’t really plan ahead.  For example. if we’re reading about the Aswan Dam, I will spontaneously give a writing assignment about the Aswan Dam for that day – they may work on it for 3-4 days, including all of the editing, etc.  My current thought is to just enter a generic “writing assignment” resource, and let the kids tell what it was in the note section…the only problem with that is, it will never be “finished” – it will forever be “worked on”….I’d love to hear how some of you have solved this!