When you plan an event, dozens of things could go wrong. Generally, only one or two really do go wrong. Most of these are tech-related and some will cause minor incidents while others could jeopardise your event.
Selling early bird - or pre-sales - tickets is generally considered a good idea when you organise events well in advance. By offering a 20 to 50% discount compared with the final sale price, you can really promote your event to future attendees.