My estimate that local events are an essential component in destination validation for the general public, and not just a consideration, is about 20%.
The base rate of travel planning in Germany is dominated by leave and budget constraints.
For 80% of travelers, events are either ignored or seen as an adjustment factor, not a main trigger.
For example, a family seeking seaside vacations in July will prioritize weather and cost over a music festival, which would likely increase prices.
Events become a major consideration only after the basic conditions are met, and often to avoid inconveniences.