The folks at Bungie were able to talk the guys at the Pacific Science Center into letting them check out Halo 3 on the huge IMAX screen.  And in true Bungie fashion, they thought it'd be cool to let a few local fans check it out with them. 

According to bungie.net, tonight at 10PM, they'll do a sneak peek of Halo 3, and they might even do a brief Q&A.  Entry is free, but you must be 18 or be accompanied by an adult guardian (Halo 3 has an ESRB M (mature) rating).  No photography, video cameras, or cell-phone cameras. 

Space is limited, first-come, first-served.  RSVP to hnation@microsoft.com.

Details, and directions, at bungie.net.