The most common reason for the majority of conversion traffic coming through as direct/(none) is that this is due to 'cross domain tracking' not being in place within your Analytics profile.
If you use a 3rd party provider for your registration process, it is vital that cross domain tracking is set up to ensure that a new session is not started when a user leaves the main site to begin the registration process.
Without cross domain tracking, a lot of our campaign data can get lost and grouped under 'direct / (none)' within Google Analytics, as a link has not been established between the 3rd party ticketing site and the main website.
The team at Tag Digital are well versed in setting up cross domain tracking within Analytics and are more than happy to assist with setup if required.