How do we remove the Maybe and No on the Events + Plugin via CSS?

We want to remove the Maybe and No options for the events (Events +) - how can we do this in the CSS code?

Second, how do we integrate Events+ with Buddypress and the Membership plugin (WPMU DEV)? We do not want people having to register three times (once for Budypress, once for membership, and once for events - just have one for everything.).