ActiveCiti is an extremely simple to use, to-the-point web application for creating, planning and organizing events. It allows people to create events, track invitees, inform them of changes, add other organizers and do lots of other event related things.
Other features include polls, forums, ability to customize the event information page, etc.
Guests do not need to be members of ActiveCiti themselves.

ActiveCiti also allows the creation of public events where in people can invite themselves and let the event organizer know of their participation.