Invitation abbr. concerning drinks

• Invitation notation
• Invitation advisory, or a homophonic hint to the starred answers' starts
• Party letters
• "We're not supplying liquor"
• "We're not serving liquor," briefly
• Invite abbr
• Inits. on a party invitation
• Quartet often near RSVP

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.

Wikipedia Word definitions in Wikipedia
BYOB or BYO is an initialism meant to stand for "bring your own booze", "bring your own bottle", "bring your own beer" or "bring your own beverage". BYOB is often placed on an invitation to indicate that the host will not be providing alcohol and that guests ...