AppoinTile is a Windows Phone 8 app that you can use as an alternative to the native calendar tile and bring a little more information about your schedule to your Start Screen. AppoinTile's live tile can display up to four upcoming events with the backside of the tile displaying a 42 day calendar with markers on days with activity.
AppoinTile was recently updated to version 2.1 and brings lockscreen support to the table. AppoinTile's live tile will show up to four upcoming appoints and the new lockscreen support will display three upcoming appointments and the number of appointments left in the day.
All totaled, the lockscreen support makes AppoinTile a very nice calendar tile alternative. There is a free, ten day trial version available for AppoinTile and the full version is currently running $2.49.
You can find AppoinTile here at the Windows Phone Store.