Party directive, briefly

• "We're not serving liquor," briefly
• Like many restaurants without a liquor lic.
• Part of an invitation to a drinker (abbr.)
• Invitation stipulation
• Party stipulation, briefly
• Letters on a party invitation indicating that booze won't be provided by the host
• Invitation letters
• Party invite letters

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
initialism (acronym) for "bring your own bottle" or "bring your own booze," by 1951.