It's not a question of 'major' or 'secondary' when it comes to travel; the real issue lies elsewhere: we should rather ask which practical constraints truly shape the choice of a destination, well beyond the appeal of an event.
Forget binary considerations of the importance of local events; there is always a third unforeseen path to consider.
For example, for my patients coming from afar to the prefecture hospital for specific treatment, the existence of a festival, whether big or small, has no impact on their travel decision.
Their choices are dictated by health and medical logistics imperatives, not entertainment.