The Jewish holiday of Passover begins next week, Monday, April 18, at sundown. Traditionally, the first two evenings of Passover are celebrated with a seder dinner. If you are looking to attend a community seder in NYC, here are some seder options that WGINY found through a google search of "NYC Passover Seder 2011":
Old Broadway Synagogue: First night seder only, follows 7:15pm evening service on April 18. $65 adults, $35 children. RSVP by April 10.
Talia's Steakhouse: Same deal for both seder nights, April 18 and 19. Seating for prix-fixe dinner seders at 6pm and 8:30p.m. $74.99 adults, $45.99 children, plus tax and tip. Includes the 4 cups of wine for kiddush and seder plate. Includes any other non-other alcoholic beverages. Talia's will also be open for breakfast, lunch and dinner throughout Passover, offering kosher for Passover meals.
Aish Center: Aish will be holding a seder on April 18, at 8pm, and on April 19 at 8:30pm, for young Jewish professionals in their 20s and 30s. Cost is $45pp.
See more options here.
Looking for a restaurant to dine at during Passover week, but not necessarily for seder? In addition to Talia's, you may also want to try Toloache. Their Passover specials look quite delicious.
I just found out that the NYC chapter of the UJA has a find-a-seder page with even more listings than above.
Chabad also has a find-a-seder page.
And, if you are looking for a self-proclaimed LGBT-friendly seder, try Congregation Beth Elohim in Park Slope or Congregation Beit Simchat Torah in Manhattan, for their second night (April 19) seders.
ANOTHER UPDATE: Even more community seders listed here!