What is interesting is to see the importance people give to local events in travel planning, especially when many consider it not even a factor.
Here in Spain, we do not always look at the festival calendar to choose where to go; we just look for a place with a beach and a good price.
If the La Tomatina festival in Buñol inflates prices, it is a direct invalidation for the trip, not just an adjustment.
The magnitude of the impact is often a clear stop, not a variable to manage, because the budget is king.