Related Clues:

• Abbr. often preceding 29-Down
• Abbr. often following 23-Down
• Invite initials
• ''No alcohol provided''
• "Let us know," initially
• Evite letters
• Invitation abbr
• Invitation reminder letters
• Letters of invitation?
• "We'd appreciate your answer," on invitations
• "Let us know if you're coming" letters
• Say you can make it, say
• Decline, maybe
• Drinker's party instruction, for short
• "Answer, please"