In This Article
Plus-one etiquette. The set of expectations governing whether a wedding or formal-event invitation extends to a guest's romantic partner. Modern plus-one etiquette is anchored by three rules: married and engaged partners always invited, live-in partners almost always invited, dating partners at the host's discretion with serious dating as the practical bright line.
Where the term comes from
Modern plus-one etiquette is the synthesis of three older traditions: the etiquette codified by Emily Post (1922 onward), the venue and budget realities of contemporary weddings, and the broader 21st-century formalization of cohabitation as a relationship marker. The Post Institute, Martha Stewart, and Brides have published the most-cited modern versions of the rules.
How it shows up in real life
A bride and groom are working a 120-person guest list. Their college friend has been with her boyfriend for three months. The boyfriend has never met the couple. There is no plus-one extended. Three weeks before the wedding the college friend asks whether her boyfriend can come. The answer, kindly, is no. The plus-one decision is set when the invitations go out and is not generally reopened.
Common misuses
Plus-one etiquette is sometimes treated as a tool to manage budgets while keeping the rules opaque. The kinder convention is the opposite: the rules are explicit and consistent. Cohabiting partners get a plus-one. Casual partners do not. Single guests get to bring a date only if the host has decided to extend that to every single guest, not to a chosen few. Inconsistent plus-ones (some single guests get them, others do not) is the most common etiquette failure.
