Related Clues:

• Invitation inscription
• ''Let us know if you're coming''
• Feedback
• Offer feedback
• Say whether you'll come
• Gasp, perhaps
• Change, chemically
• Give a counterargument
• "Please answer"
• Say "wow!", e.g.
• Accept or decline
• Inform the host
• Respond
• Part of a prospective bride's pile
• Sign up again