Jumping from the mid-eighteenth to the early nineteenth century:
I first came across a description of Mrs. Walker's Masqued Ball as it was published in a Philadelphia journal, The Port-Folio, on January 19, 1805, with a credit to the The Morning Post, a noted London newspaper which famously covered the social activities of the upper classes in Regency England.
For several years, I had the article filed under the date 1805, but with a suspicious note attached because the outdoor party described (with a hostess concerned about the possibility of the heat being "oppressive") didn't sound likely to have occurred in January, even in England. I still haven't found the original Morning Post article, but I did turn up a shorter version of the same description (minus all the costume information) that was published in The Lancaster Gazette (of Lancaster, England, not Lancaster, Pennsylvania) on Saturday, July 14, 1804, with one critical word present:
on Wednesday se'nnight [emphasis mine]

