adding event registrations later under same email
Members who have logged in to the site and registered for an event cannot return later and add more people to their registered party under that email. It'd be great if you could add that functionality.
Marily Mondejar commented
Eventbrite has this option. Eventbrite also have an option like this: A Registrant can also create a "group" or a "table" and invite their friends to add their names to the registrant's table when they register.