The idea that flight search engines directly transform the impact of local events into a tangible planning reality is an oversimplification.
These tools are price search instruments, not weather forecasts, and do not themselves translate the ambiance or accommodation availability, but reflect flight prices that can be influenced by these events.
They show prices soaring due to an event, but do not tell you if the hotel will be full or if restaurants will be crowded, like the Sanremo Festival which causes flight prices to Genoa to explode without indicating local saturation.
Maximum performance requires additional research beyond the simple flight interface to anticipate all variables of a stay.
One must go beyond price for a full expression of the experience, otherwise one is content with a simple fare observation.