Nobody answered yet; kinda weird...

Anyway, there are at least two possibilities:

...concernant 'Jours de Ventes Exceptionnels'

or

'Jours de Ventes qui restent' with 'outstanding' in the sense of 'remaining', even though I don't think this is the case here given your heading 'Positive Examples'

Then again, if 'Jours de Ventes Exceptionnels' is what is meant here, I wonder why your sentence doesn't read 'Outstanding Sales/Selling Days' ?

Would you be able give more info about the text you're translating ?

Have a nice weekend,

EDS