Actually, anytime is a great time for becoming organized and it fits really well with your spring and fall house cleaning.
Make or get a Family Planner and start to use it. You will be surprised at how much better you and your family are prepared for coming events and how few, if any, appointments and birthday cards are missed. Tip: Schedule your daily chores as well to let everyone help.
To make a family Planner go to Microsoft Outlook or OpenSource.com and print out their full size calendar pages
Drop your car and house key in a basket there when arriving so that when you leave again, these items are readily available. It is also a great place for the new cloth shopping bags so you will not forget them when leaving for shopping. A Bulletin Board fits in here nicely if it works in with your space and ambience. School lunches placed there in the morning, brief cases, library books that are due to be returned, outgoing mail and so on, will remind ALL the family of little chores which are waiting to be done.
Whether you follow the Specials, do regular weekly shopping or buy in bulk your freezer can quickly become a quiz of "What is in there?". Containers for freezers can also help you keep the contents sorted, to avoid uncomfortable shifting of goods.
This is a perfect time to discuss "left-overs". Use sandwich plastic bags and make one-serving portions. Then rebag these one-serving portions, of like kind, into a freezer bag. Label and date the freezer bags. Now you can take Friday Nights off from cooking. Use the microwave oven to reheat. Everyone can mix and match what they would like to eat from the left-overs. What does not get used within 2 months turn into soup. Use your fridge freezer for left-overs and the regular freezer for the rest of your goods. You will save a whack of money doing this.
If you don't wait for January, rather do a major clean up at least monthly, you will find your home generally very organized generating less stress on you and your family. It makes for a happy home.