Dense would be if you gave up on GoogleCL because of a problem without asking about it first :)
Setting reminders is done with the --reminder option.
Dates of events to retrieve from the server (for listing, deleting, etc.) uses the --date option
In general, if you're having trouble with the usage, check the following docs:
For example, the manual has a section on Calendar, and at the end, a section on how to use --date.
If anything is unclear or confusing, just let the mailing list know, and we'll clear it up or fix the docs.
- Tom