well, basically, it allows you to create an event. you write when, where, choose the number and class of person you want to come, and level too.
then, we add or delete oursleves to the event. but if we don't have the addon, we can't see the event....
I remember faces easily, but I'll make an exception for you.
A frog's life
A frog's life sur facebook
Ze blog BD sans dessin