Seems like the blog mode would do what you're looking for. Having a small calendar somewhere, than when clicking on a date brings you to a page with that day's events, yup, that's blog mode.
As far as adding events, that has to be done through the events manager, so you'd have to hard-code a generic username/password in the link that would say "Add Event". But you can't have the calendar that's on the front page link you directly to the event manager.
I need to study a little more the new version (v6.3) as I've been away for a week and need to catch up.
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