I reckon quite a few people did stay for SZA and thought she was decent tbf.
I say this tbf as someone who knows they'd have been at The National instead.
Maastricht is apparently the closest, although I didn't know there was an airport there ngl.
When I did my research for a consideration of coming along, I looked at Cologne. Apparently Dusseldorf is closer than there. Eindhoven might be a go-er as well.
Guess it depends where you're coming in from.