You want a chance to throw a party on Microsoft’s dime? If you have access to Xbox Live, the computer software giant is giving you the chance. They’ve got a promotion running now for “Xbox Live Arcade Wednesday Party-In-A-Box”, which is essentially getting you to have a party on a Wednesday night tied to the weekly release of a new Xbox Live Arcade title. In exchange for taking photos and submitting them to Microsoft along with details of your shindig, they’ll give you a coupon for a free Papa John’s pizza, 1000 Microsoft points to download Xbox Live Arcade titles and a free digital music download for your favorite 80s tunes. How retro…