 
Manage your calendar entries
Deleting past entries in
Calendar
saves space in your
device memory.
To delete more than one event at a time, go to the month 
view, and select 
Options
>
Delete entry
>
Before date
or
All entries
.
To mark a task as completed, scroll to it in the to-do view, 
and select 
Options
>
Mark as done
.