All The Way

In which Xander and Anya announce their engagement, Willow slips Tara a magic roofie, and Dawn follows in her sister's vampire-kissing footsteps.

Official back-of-box synopsis:

On Halloween, Dawn experiences her first kiss... only to discover that the object of her affection has a deadly secret; Xander announces his engagement to Anya; Tara worries about Willow's reliance on magic.

Links:

This episode's page at http://www.restlessbtvs.com/, the Restless BTVS Trivia Guide

This episode's page at http://www.vrya.net/bdb/, the Buffyverse Dialog Database

Cross-reference:

episodes in which people wear amusing clothing:

• Inca Mummy Girl
  The Cultural Exchange costume dance
• Reptile Boy
  Xander in drag
• Halloween
  Some of the clothing is deadly serious, but Caspar!Willow and Pussycat!Cordy are unforgettable
• Fear, Itself
  Mexican Giles, Bunny Anya...
• Doomed
  Spike in Hawaiian shirt and boardshorts. Somehow he's still sexy.
• No Place Like Home
  Giles is in a Wizard costume. Buffy is speechless.
• Hells Bells
  Those bridesmaid dresses...
• this episode
  Pirate Xander, Charlie's-Angel Anya

Cast:

• Sarah Michelle Gellar as Buffy
• Alyson Hannigan as Willow
• Nicholas Brendon as Xander
  

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• Anthony Stewart Head as Giles
• James Marsters as Spike
• Emma Caulfield as Anya
• Amber Benson as Tara
• Michelle Trachtenberg as Dawn
• John O'Leary as Mr Kaltenbach
• Kavan Reece as Justin
• Amber Tamblyn as Janice
• Dave Power as Zack
• Charles Duckworth as Glenn
• Dawn Worrall as Christy
• Emily Kay as Maria
• Adam Gordon as Carl
• Sabrina Speer as Girl
• Chad Erickson as Guy
• Dominic Rambaran as Paramedic #1
• Anthony Sago as Paramedic #2
• Lorin Becker as Witch Woman
• Lily Jackson as Witchypoo
• Steven Anthony Lawrence as Chunky Kid