Volunteer Software! For Joomla?

I was wondering if anyone could help me find a type of Volunteer Management system for Joomla.
The only requirements i need are:
* free
* Be able to register for events
* be able to record hours
If you know a lot about joomla, Here is the in depth specifics. I need a component that anyone can submit volunteer events, but the administrator would need to approve. After they approve, all users can sign up for that event. Then, some kind of hours recording needs to be implemented. I would love it if you could help!

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