:Sorry, i wasn't being clear: we can note the Venetian masks of the partygoers, as we have citation for that. the women wore feathered masks of a different kind, and we cannot classify them as "carnival/carnivale" masks without equivalent citation. It is the primary difference between you saying they are such and someone notably citable saying so. You might be an expert on the subject, but unless you are cited in published material, we cannot use that expertise to substantiate something  - indeed, anything - within the article.  
 :Unless you can explicitly cite the women as wearing carnivale masks, we cannot call them such. -