Rated 4 out of 5 stars

Love this add on, but it is not caching for offline use. Unfortunately, this would be a deal breaker for me. If I open my calendar while offline, I cannot see any events. Instead, I see a message indicating that it is failing to connect.

This review is for a previous version of the add-on (1.0.2). 

Caching is actually on all the time. Could you visit the support forum and tell me more about your error?

Update: I actually tried this and its working for me nicely. Make sure you've at least once downloaded all items.