Name the occasions
List familiar events that tend to involve preparation, such as school transitions, celebrations or a change of season. Write down the tasks associated with them rather than guessing a single total.
Inventory before shopping
Look for items that can be reused. Record what is already available and what needs checking. Keep estimates clearly labeled until you have actual prices or receipts.
Review after the event
Make a short note about what you used and what was unnecessary. Your own observations can make next time easier to plan, without treating last year’s circumstances as a guarantee about the next one.