Bungie Day
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Bungie Day, which occurs on July 7, is a mock holiday created by Bungie Studios to celebrate their long standing infatuation with the number seven. The date, when shortened, is 7/7. Bungie Day was originally meant to happen on dates where the month, day, and year are all composed of ones and sevens, but has since opted to celebrate it every July 7th.
Celebration
Bungie celebrated the first Bungie Day on July 7, 2007. They celebrated in a number of different ways, mostly for the benefit of the public. Since the day fell on a saturday, it is likely that most Bungie employees were not actually working in the office that day.
For its 2008 Bungie Day, they are going to release exclusive gamerpics and a dashboard theme over Xbox Live.
Bungie.net
The 2007 Bungie Day was celebrated on Bungie.net in the form of a post detailing newly announced material for the then upcoming Halo 3, including a new wallpaper featuring a multiplayer battle, as well as 3-D movie/screenshots of the recently revealed CQB Armor and the EVA Armor along with canon information about their background and development, as well as background information on the Brute Chopper vehicle.
Xbox Live
2007: Xbox Live also saw some celebration from Bungie studios in the form of free downloadable content from the Xbox live Marketplace. All new gamer pics and a new dashboard theme (titled Bungie Day 2007 Theme and Bungie Day 2007 Picture Pack) were avaliable to download (free of charge) until 0900 (GSM) the following Sunday. In addition, the Halo 2 Blastacular Pack, originally a download that cost $4.00, became permanently free. It was also announced that the maps included in Blastacular Pack (Desolation and Tombstone) would be fully added to the matchmaking system for Halo 2 in the coming weeks (at this time there were still a few matchmaking playlists that did not include these maps).
2008: Bungie will release gamerpics and a dashboard theme for only one day.