You can start taking notes in Apple Notes when your iPad is locked.
Apple Calendar is a planning, free app from Apple for tracking your events, appointments and meetings. It compliments Apple Reminders. The app is available for … More Apple Calendar »
Apple Notes is a free note-taking app for your iPhone, iPad and Mac. It also has a web version that is accessible from any web browser.
Apple Reminders is a free, simple, to-do, Get Things Done app from Apple that comes preinstalled on your device. Before looking for a planning app, why not try this one first.