West Wall was a district at Gen Con 2012 where a special Convention-only adventure was run. The name of the adventure itself was The Dawn of Night. It is unfortunatly not available for sales.
West Wall 4th Edition Adventure (Room 134)The West Wall district is home to many of the old, established families of Menzoberranzan, including noble houses and wealthy families alike. This location features an exclusive adventure, in which attendees play drow characters as they lead the assault on a Temple of Lathander in Dagger Falls. For attendees who played The Sun Never Rises earlier in 2012, this adventure presents a different spin on that adventure's events.
D&D Special: The Dawn of Night (2 Hours)Lead the assault on the Temple of Lathander in Dagger Falls as you play drow looking to further Lolth’s aims to dominate the surface world and strike a blow for darkness! Characters are provided.
I'm sure eventually it will make its way onto evilbay
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I too played West wall and thought it was great. I also hope we get access to the adventure through some legitimate means. Although it may only be a small consolation, if you're looking for the 6 pre-gens from West Wall they were the same ones used for D&D Encounters Season 10: Council of Spiders which are available in the Dungeon's Master Pre-generated Character Library.
But build better characters than that. Every one of those characters is noticeably and obviously sub-par (especially after first level).
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Dark Sun's Ashes of Athas Campaign is now available for home play (PM me with your e-mail to order the campaign adventures).