Nathan Sawaya's display, The Art of the Brick, is traveling! If you didn't see it in Pennsylvania, you can see it in Illinois in June and Connecticut next year! You can get more info here.
Sean Kenney was commissioned to build a mosaic for Google, and you can see it here.
He's also going to be in a gallery presenting a bust of...William Shatner. Really. You an read that here.
In Canada, the guys at Brickville Designworks are at Saskatchewan Science Centre with an Egyptian themed display, LEGO: Secrets of the Pharaohs. There's some info here.
Dan Perker will be doing a LEGO Camp for kids (kindergarden through 3rd grade at Seabury School), Tacoma Washington in mid-July. There's info here.