Most of these economic assessments use a form of magic maths rather than real accounting: X people attended and spent a theoretical Y euros per head, generating Z income for the city on the day. Some go further and say that N visitors will return in future years and so add in future income from these visitors.
It's not a case of the organisers spent however many hundreds of thousands or millions of euros and generated ticketing and merchandising and sponsorship income to match that. The organisers and the towns/cities spent the money, local businesses reaped the rewards
Colour me jaded but the modelling is built in such a way as to not fail. I've read many of these economic assessments over the years and they all come to the same conclusion: we did a really good job, go us.
What few of these reports do is question the visitor traffic displaced by the event (eg you probably won't want to holiday in Paris in the first weeks of August 2024 if you're not an Olympics fan so for some businesses income may actually be flat rather than rise) and they obviously do not take account of other factors that might have attracted you to the area at that time (eg the year-round efforts of the Dutch tourism board).
Soz, that's a long response to a small feel-good story.
Facebook
Twitter
Instagram