Dear users,

I would like to use RSEvents to find out if members of our choir are available at a certain date to perform during a concert.
I have tried to manage this by making an event for registered people of our site in which they can participate in an event. So far so good.
But I'm not able to see if someone can't go the the concert or just did not go to the site to let it know. Everyone who isn't in the list could be unavailable or did not see this part of the site at all.
Is there a possibilty to change the settings so they can mention they won't be going?
Or am I using the wrong extension for it?

(Later on we are going to use RSEvents for tickets for visitors, so RSEvents will still be helpful for us.)