Goodrich Hoist and Honeywell start the ball rolling in nearby hotels a few days before the event starts.... 3-4 for Goodrich and 4-5 for Honeywell. There are parties available with both these. You need to sign up though.
Best day is always the first .... various launches on stands.....but frenetic all over ... but if you want to see the show 'easy' go the last day.... it is quieter and those on the booths will have more time for you.