Related Clues:

• Party invite initials, sometimes
• "Let us know," on an invitation
• Letters for an invitee
• Invitation initials
• Request from a party leader
• Invitation inscription
• ''Let us know if you're coming''
• Say whether you'll come
• "We're not serving liquor," on invites
• "Please answer"
• Accept or decline
• Inform the host
• Part of a prospective bride's pile
• Party stipulation, briefly
• Say you'll go, say