The lightest expression of destination validation does not incorporate local events as a decisive factor from the start.
It is not a stable element of planning but rather a last-minute adjustment to save money or time.
For example, here in Portugal, if Porto is saturated due to a festival, we do not change destination, we simply look for another less expensive neighborhood or shift the visit by a day.
It is a low-energy cost solution, not a complete overhaul of the entire travel plan.