You can update a CalendarRules event from within a matter record.

How to Edit a CalendarRules Event

1. Log in to Litify.
2. Navigate to Matters > [Matter Name].
3. Navigate to the Calendar Rules tab > Update/Edit tab.
4. Find and select the Trigger Name that owns the events. 
   
5. Navigate to the trigger record's Associated Events tab. 
   
6. Select the Event's [Subject Name]. The Event's record details appear.
7. Select Edit. 
   
8. Make updates.
9. Save.