I attribute a validity of 20% to the statement that local events "drastically affect" travel planning, and I rate it at a strength/10 as a decision factor.
In Germany, for example, the stability of public transportation and access to medical services account for 60% of my travel decision, while the impact of cultural or sports events does not exceed 15%.
A price spike of 20% due to an event is not comparable to the guarantee of good health coverage or predictability of basic costs.