Andrew,
I saw your post on AB so I thought I'd take the time to answer it here.
SNE is Saturday Night Express. Usually the second Sat of every month. A lot of fish folks log on to aquachat and then chat or maybe put up wish lists for auctions. Sellers are listing tons of 1-hour duration auctions in all categories. There's also a trivia game where if you're the fastest to answer a trivia question correctly, you win the prize. Prizes are usually offered by other hobbyists as well as sellers. It usually runs from about 7:00 - 11:00 but some sellers start early and end late.
mike

Thanks, Mike! Everyone was talking about it without explaining what it was and it was driving me crazy!