Users who have purchased the ad-free upgrade have access to the Today View Widget! The widget allows you quick and easy access to your countdowns without having to open the app.
You can view your countdowns by opening the Today View (swipe right over the Home screen, Lock screen or while you're looking at your notifications) or by using 3D Touch on the app icon.
You can add events to your widget while editing them. Just tap on the switch.
You can learn more about widgets on Apple’s website.