My probability that local events are the main factor in choosing a destination is quite low, around 20%, even after considering planning.
The base rate for most people, especially those traveling with budget constraints or children, is that vacation dates and total cost have a much greater impact.
For a typical British family, the availability of the school holiday week or affordable prices during summer vacations often outweighs a cultural festival.
The priority is to go, with financial logistics and fixed dates being the true drivers.