Mobileread
This .ZIP file I'm uploading contains the apps which come in the separate bundle for CyanogenMod. CyanogenMod is a very popular Android mod which had certain problems with Google because the modders were shipping proprietary apps of Google with their mods (such as GMail, Maps and so on). After a cease-and-desist letter, Cyanogen and his team decided to offer the proprietary apps unbundled from the CyanogenMod ROM, in a very similar fashion to the famous Microsoft solutions about Internet Explorer and Windows Media Player.
Try the Calendar Apps in this file, and see if they work.