It’s party time at the Talk House, the kind of hangout people of a certain age or nostalgic bent associate with Greenwich Village watering hole like the White Horse Tavern and the Lion’s Head, where tatty writers schnorred drinks and grubbed smokes from plusher colleagues and woozily embroidered tales of the good old days. Wallace Shawn’s Evening At The Talk House, a New Group production at the Signature Theatre Center, takes place at the Talk House on the 10th…