Related Clues:

• Be a polite invitee
• ''Save the date'' follow-up
• Aid for an early head count
• Supervisors drop serious summons from The Party requesting answer
• Use an SASE, perhaps
• It may contain regrets
• E-vite request
• Click yes or no on an e-vite, say
• Evite request
• Letters on a wedding invitation
• "Kindly let us know," on invites
• Answer an invitation, for short
• Evite notation
• Reply to the invite
• Answer the host, for short