THERE’S NOTHING EVEN CLOSE to an “official” Cobain 10th anniversary memorial planned for next week. But some fans are planning a very informal “meetup” on Sunday, 12-2 p.m., under the Space Needle. Participants are advised to identify themselves by having “a normal/any ink pen or pencil in your hand. Carry it easy to been seen and display. We wanted to think of something not so obvious, so creey crawler weirdos don’t try to see whats going on. But it may happen anyway.”