Veronica, you sound like I used to before my students did their performance of "A Midsummer's Night Dream." I also looped with my kids, and this event was the culmination of 2 years of hard work. The kids always surprised me with their awesome performances.
Limewave, routine and structure will help you keep up with all of the papers. Go through your kids' bags at the same time everyday and sort the stuff into important, not so important, and throw away. If you are not sure about some of the stuff on the notices, ask your kids. I bet they will know! Then, write things on your big calendar. Having your daughter help do this is a great idea. I suggest a big white board type calendar that is erasable and can be used over and over.