Here's how you can download the Sunrise Calendar app free for your iPad, iPhone, iPad mini or iPod Touch.
1. Go to the Sunrise Calendar app preview page in iTunes (or tap the link on your iOS device to install the app directly).
2. Click the View in iTunes button.
3. Click the Free button to download the app.
4. Sync your iPad, iPhone, iPod Touch or iPad mini with iTunes to install the app.
Here's a description and screenshot:
"Sunrise is a free calendar app made for Google Calendar users. Designed with love, Sunrise is a new experience that will make your life easier."