For those who think 7pm is a little late to begin having liquid refreshments, the unofficial Eschacon '08 preparty will be at the Khyber.
Here's a map showing Lucy's Hat Shop (A) and the Khyber (B). Both are conveniently located near the 2nd st. subway stop. Both are about a 20+ minute walk from the hotel.
...probably a $6.00 cab ride to/from hotel (or less).