So we're thinking about an integration to EventBrite and TicketLeap as optional features after composing an event. Neither company's API (actually, I don't think TL has an API) considers sub-event data. So EventCast can essentially serve as an event authoring tool that can be pushed over to EventBrite (optionally) to enable ticket sales and other EventBrite features.

Competing against Facebook...If you are only inviting through the graph, it might be hard, but I think there are plenty of situations where organizers and guests are less well connected. Hmm.. LinkedIn...we're open to chatting :).