This is going to be a big week for game nerds. Sega, Electronic Arts, Ubisoft, and Microsoft are all holding events this week. Saving the absolute best for last, Microsoft will be showing Halo 3 on Friday. Electronic Arts is promising to debut Harry Potter and the Order of the Phoenix, Wing Commander Arena, a new game titled Boogie, and the standard crop of NCAA, NASCAR, and The Sims titles. Ubisoft and Sega, for now, are not saying what they plan to reveal... This is what the demise of E3 has wrought:A series of small, intimate, gamer's day events where the game writers can sit and play without the distraction of competing 500-decibel serenades, hordes of unwashed game store clerks on the hunt for tchotchkes, and endless meetings piled one on top of another...