Julian Koster, member of the Elephant 6 Collective, former member of the legendary Neutral Milk Hotel and current leader of The Music Tapes, will be playing in Central Park tonight to his two stuffed animals. An acorn will be your ticket in, and there are plenty of other instructions that should keep you busy up until show time, which is 10:46 p.m. (not a moment sooner). This is a rain date for a previously scheduled......