A calendar should help with the work around the date.
A holiday has dates, but also passports to check and bags to pack. A birthday has a day, but also a present to buy. A renovation has a goal, but also an order the jobs need to happen in.
Planner connects those pieces. Fixed commitments, flexible tasks, preparation and project time can belong to the same plan.
Sharing the diary is only a start.
It helps to see the same appointments. It helps more when the work has an owner and a place in their day. A household plan should include the people you care for, even if they never sign in.
And when life crosses two homes, your planning should be able to cross them with the right permissions.
Good software should leave you with fewer decisions.
Start with the calendar. Add the tools you need. Let Planner fit flexible work into the time available, and use Percy when talking something through is easier than filling in a form.
The aim is familiar enough to use every day, with enough thought behind it to handle the parts of life a calendar usually leaves out.