Can I add users to Events as an event admin?

Can I add users as RSVP (yes/no/maybe) as an admin of the event?

All users I am talking about are registered WP users.

Basically some users are lazy and will respond I'm in via email but they don't want to or frankly know how to login and click 'Yes'. I know sounds ridiculous.

But as the event organizer, I want to be able to go in and add them as RSVP (yes/no/maybe)...

Is that possible or do I need to login as them and then do it?