Do flight search engines really transform an idea like the impact of local events into a concrete and actionable reality? They forget that historical precedent clearly shows travelers have always anticipated these things, often with simple calendars and paper guides.
Historically, people checked local festivals or important matches to plan, long before the internet; these digital tools only aggregate information that has long been collected otherwise. Attributing to an app the power to "concretize" what has always been a planning reality is a bit self-serving.
For example, for the Cologne Carnival, people knew well in advance that the city would be crowded and hotels expensive, without needing an algorithm to tell them.