Répondez s'il vous plaît.
In order to make this the best possible time, it really helps to to know who is (woohoo) or isn't (bummer dude) or not sure (I'll be calling you) coming.
It's simple; select the "event" from the drop-down menu then type in your names, email, whether you are planning on attending and if so, how many and if you need any special arrangements, include it.