I fired off an email to their Support team earlier today, per Carl’s suggestion. I poured through my settings and made sure that I had everything marked as it should be (to my best understanding).
I was reading through some of the material in the generic auto-reply I received from Google and a byline on one of the pages hit me:
“Currently, notifications only include events on your primary calendar. You won’t be notified about events scheduled on your secondary calendars or on calendars listed under “Other calendars.” If you’d like notifications for certain events, make sure to schedule those events on your primary calendar.”
Great … so in order to be notified of events on my other calendars, I need to combine them all. Now what about ones from other sources to which I am subscribed?
*beats head on desk*
I remember now why I hate Google Calendar. 
Carl S
Don’t hate us!
We’re working on this problem of getting notifications on other calendars. Stay tuned.
Nitallica
:)
Nah, I don’t really hate you guys. T’was aggrevated and needed to vent.
Honest!