In addition to the usual show floor booths and Day 0 press conference, Microsoft will be holding a series of events to allow the general public a chance to be a part of the action. You can get a full list here, but the more interesting events are as follows.
It all starts on Sunday with a fan event at the Century City Microsoft store, where fans can get a look at Microsoft's E3 line-up. Most of all though, you can enter a raffle to get a seat at the Monday press conference. There will be 100 seats up for grabs, so chances of winning could actually be pretty good. If you don't manage to win a ticket into the press conference though, fans can still participate in a pre-show event.
Fast forward to Wednesday, and it's back to the Century City Microsoft store for hands on time with Sunset Overdrive. There will even be free Overcharge Delirium XT. I'm predicting it will be made of orange juice and Red Bull. So like a mimosa, but with a lot more tweaking. Please folks, tweak responsibly.
If getting to the greater LA area is not doable, you can watch most of the proceedings on Microsoft's Twitch channel, including live demos, developer interviews, and the press conference. There will even be fan Q&A via Twitch chat and Twitter throughout their stream.
Here's how to join Xbox at E3 2014 [Major Nelson Blog]