Related Clues:

• SASE contents, perhaps
• Invitation acronym
• Free and easy
• Party thrower's request
• Say you will, or won't, be there
• Invitation ltrs.
• "We're not serving liquor," briefly
• Party invite letters
• Brief answer?
• "Answer, please" (Abbr.)
• Invitation request, for short
• Abbreviation for "Answer, please"
• Party letters
• Let people know if you're coming to their wedding
• Not formal