stagette
/staˈɡɛt/noun
1 US. A woman who attends a social function without a male partner.
2Originally (US ): a party attended only by women (now rare ). Now chiefly ( Canadian ): a party given for a woman who is about to be married, typically attended by women only.
Origin
Early 20th century; earliest use found in Pacific Printer. From stag + -ette.