Enough theory. The impact of local events on travel planning is often a variable, not a fundamental invalidator of the destination itself.
You need to look at the ticker to know when and where the impact is real, not just a generality.
For example, the Feria de Sevilla makes the city more expensive and crowded for a week, but the rest of the year, Seville remains a very accessible destination.
The true trigger for destination validation is overall accessibility over an extended period, not event peaks.
We need to define the order: the event is an adjustment, not a decision.