public async Task CreateConference(ConferenceInfo conference)
{
if (await _conferenceRepository.CheckExistenceBySlug(conference.Slug))
{
throw new DuplicateNameException("The chosen conference slug is already taken.");
}
// Conference publishing is explicit.
if (conference.IsPublished)
{
conference.IsPublished = false;
}
await _conferenceRepository.Create(conference);
_hostServiceBus.Publish <IConferenceCreated>(new ConferenceCreated(conference));
}