When you try to add a already created household as an event registrant the system asks the user to choose which household member is registering for the event because households cannot be an event registrant. But, when you add a household on the "Fly" when adding an event registrant you do not get that same pop up message. Instead you get an error message that says that "Registratns must be individuals or organizations". It would be great if we go that same warning message so you did not have to go out and search for the household member to add to the event registrations.