jfa1, I'd recommend going into calendar settings and clicking "Only show Facebook events I've responded to." Then on Facebook you can decline American Spring and you won't see it anymore.
To turn off birthday reminders, to to your Hotmail Calendar and click on "Birthday Calendar" on the left pane. There should be a "reminder" setting there. However, this applies to "newly created events", so perhaps refreshing the calendar will refresh the reminders as well.