Volunteer schedule

Hi, I’m looking for a plugin, if such exist, where I can set a calendar with several volunteer activities and members can log in and register themselves to a certain duty.

For example;
July 7th 2015 – cleaning the kitchen

Eddy logs in and signs up you automatically see;
July 7th 2015 – cleaning the kitchen – Eddy

And Eddy doesn’t like to work alone so Beatrice signs up to and her name is added to the same schedule calendar;
July 7th 2015 – cleaning the kitchen – Eddy, Beatrice

Am I making sense? I hope so. Can anyone help?

Thanks a bunch!