I missed an important conference call at work today. I had set a reminder in Google Calendar on my work calendar to popup at 5 minutes and 15 minutes prior to the call. The notifications never occurred.
Why? Well, it took me a while to figure it out, but eventually I realized that notifications do not appear for calendars that are not currently being shown! I have many calendars for my children's school, work, bills, appointments, etc. and I typically only show to my work calendar when I need it while at work. I never imagined that I would need a reminder to turn on my work calendar so I could get reminders from it! Don't you think that kind of defeats the purpose?