Connecting local events like festivals to flight search tools is a misuse of their primary function: price. These platforms are made to find the best fare, not to tell us if Rock Werchter is sold out, it's not the ticket for concerts. We use Skyscanner to avoid the exorbitant transportation costs, period. I have a friend who saved 150€ on a flight to Marseille during a jazz festival, just by changing the departure airport in Lille.