Flight search engines are not the direct and main realization of the impact of local events on a stay; it is a distortion to rely solely on them.
Honestly, if we hadn't already invested so much attention in these platforms, would we see them as the primary solution to understand the real impact of an event?
These tools are made to find flight prices, not to explain the atmosphere of a city or logistical hassles that a festival can create, like massive traffic jams in Cannes during its Festival.
To truly anticipate and understand an event, more than just a list of fares is needed; specific information about the event itself is required.
We focus on the ticket price, but forget everything else: saturation of public transport or lack of seats in local restaurants.