It was possible to play the multiplayer portion of the game at Microsoft's "press meeting" - the did such a party-like meeting instead of press conference.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/19716902@N00">włodi</a> from London, UK
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/wlodi/1285436474/">Halo 3 Multiplayer at Microsoft Press Meeting</a>