Related Clues:

• Succeed, with "through"
• "Let us know," to an invitee
• Acquire, with "by"
• ''Ready or not, here I ___!''
• Answer, shortly
• SASE contents, perhaps
• Invitation acronym
• Party thrower's request
• Say you will, or won't, be there
• Invitation ltrs.
• Brief answer?
• "Answer, please" (Abbr.)
• With 54-Down, approach with a line
• Canine order
• Invitation request, for short