I made my own quite easily, in a three-ring-binder. There are tabs for a year-long, one-page calendar for quick reference, a tab for daily schedules (like what time we need to be in the car for x activity), and a big, fold-out calendar of the year that I made using a spreadsheet application (excel or whatever you have). On that are all of the 'knowns' of our year....our family celebrations and holidays, weekly themes for my Kindergartener, and an outline of all the blocks I want to do with my first-grader. That's where I can pencil in activities or whatever to add. The rest of the binder is weekly tabs, one per week for the whole year (including holidays and things). In that section, I plan weekly a couple of weeks ahead. Anything that still needs to be done can just be moved over a tab. I can see pretty easily how 'on-track' we are and adjust my expectations accordingly.
In addition to that binder, I have my own, half-size binder which is my personal calendar, notebook, etc. This is small enough to schlep around in the diaper bag, so that's where I jot down class times and meetings for co-ops etc. And I keep a big file of resources in another binder system....articles that resonate with me, lesson blocks that I'll want to use some day, recipes, songs, verses by season to use with our largely seasonally-based curriculum, special holiday crafts, etc.
Worked well last year! Hope it does again. And hope that helps you, OP.
ETA, sorry, Mamma-brain, I didn't answer your question! So, at the beginning of each week, I have printed out a form (which I made, again very easily with Excel or Word). Each week, I fill out what the seasonal theme is (Apples, Harvest, Winter Animals, whatever) for the little ones, then the lesson block that the older one is doing (Language Arts, Math, whatever), specific lessons I want to do (title only, the lesson goes behind the main page for the week) and a note of where we might need to go that week (outdoor science class on Wednesday, art class on Friday, Co-op day on Thursday, and the baby has a check-up on Monday at 3). This means that when I'm planning for next week on Saturday, I can look at what we've done, what we need to do, and when I can plan lessons.