you either sell out or you dont

obviously a full sell out will be 100% ticket of all available tickets but to be fair lets say 95% is a sell out

i am almost certain none of the shows on this run has sold out based on what i have read/seen (though not been to a show myself).

the promotion company will call it a sell out at any number they wish so it could be as low as 80%.

that said i have never been to a large show (think stadiums) where there havent been big gaps but that could be due to a number of reasons, at a gig its usually obviously if the show has sold throughly well or not.