From Halopedia, the Halo wiki
The Humpday Challenge was a weekly game which took place between Bungie Studios employees and large Halo fan sites, active communities, and professional teams. Humpday Challenges always took place on Wednesday.
Numerous communities hoped to challenge Bungie Studios, but few were selected. To be selected by Bungie for a Humpday Challenge was a challenge in itself. Bungie Studios did not take skill into account when choosing opponents, rather, they picked teams to play based on community activity. Other companies or groups that had some kind of niche were picked most often. Bungie did not seek to play the best players, but to gain mutual publicity from the coverage that a Humpday Challenge brought, usually playing administrators or community leaders from prolific websites.
Bungie has regularly played various groups during the challenge, and some have had the honor to play the company twice. A list of opponents Bungie has played includes:
|11-1-2007||Geezer Gamers||Bungie 3-0||GeezerGamers is a gaming community built for and by men and women in their 30’s and beyond.|
|11-8-2007||Podtacular||Bungie, 2-1||the "Unofficial Halo Universe Podcast". Site administrators played Bungie and were defeated.|
|11-15-2007||Anonymous Users||Bungie, 3-0||For the anniversary of the creation of Xbox Live, five Bungie players prowled Matchmaking and played three randomly generated teams, beating them all.|
|11-29-2007||Halo3Junk.ws||Bungie, 2-1||halo3.junk.ws is the largest aggregator of Halo 2 statistics on the internet. Bungie played the administrators of the site and defeated them.|
|12-6-2007||PraetoriaGuard||Opponent, 2-1||The PraetoriaGuard is a "Halo fansite with a rich community". They defeated Bungie 2-1, being the first group to defeat Bungie employees at Halo 3.|
|12-13-2007||Clantacular||Bungie, 2-1||Clantacular is a multiplayer community which has supported ranked clan match service for Halo 2 and Halo 3.|
|12-20-2007||The Frag Dolls||Bungie, 2-1||The Frag Dolls are a professional team of all-female gamers recruited by Game Company Ubisoft.|
|9-15-2010||343 Industries||Bungie, 3-0||343 Industries is a company within Microsoft that manages the Halo series.|