The cheapest version of the trip does not involve planning around local events, but avoiding them if necessary to optimize costs and simplicity.
The idea that local events are a decisive factor for all travelers is an oversimplification; for many, budget flexibility prevails.
Most people choose a destination because it is affordable and matches their available dates, not to attend a specific festival.
For example, a cheaper flight to Amsterdam off-season, even without major events, is often preferred over a more expensive trip during Pride, which also complicates bookings.