User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-77.5.168.79-20130325160614/@comment-119.93.94.59-20130326021246

I think they appear in the tavern at random or something. Or maybe after every two quests? All I know is you could only have 3 in the tavern at a time. AND at some point, you could set criteria to filter what random quests appear.