These sites are pretty nifty if you are an organizer of some event. They will let you produce your own tickets for that event, either on- or offline, and advertise them via their network. Check it out!

• Amiando lets you make tickets online and create professional registration forms for events. That means that an event manager can start his online registration or online ticketing without any knowledge of programming. Free version, or a paid version at 1 euro+6%.
• Eventbrite helps businesses & organizations of all sizes manage and promote their events, all via their site. Lets attendees register or buy tickets online for your event. Also sell tickets and collect registrations directly from your own website by embedding the ticket widget. Free for free events, paid events 2,5% of tickets value + USD 0.99 per sold ticket.