Letters on some invitations

• Invitation advisory, or a homophonic hint to the starred answers' starts
• Part of an invitation to an imbiber
• "We're not supplying liquor"
• Party spec
• "I'm not providing, you drunks!"
• Informal invitation letters
• "We're not serving liquor" party invitation notice: Abbr
• Party invite letters
• Party stipulation, briefly

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 ...