Frasier gets invited to a psychiatrists' conference in Boston, and takes Niles, Daphne and Martin with him. By chance they meet Cliff Clavin (from Cheers) in Boston airport, and Cliff thinks that Frasier has come to Boston for his retirement party. Not wanting to let Cliff down, Frasier agrees to go to the party, and drags the rest of the family with him.
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Warning: Frasier season 9 episode 21 guide may contain spoilers