Good grief, folks, it's not that hard to look it up. It's called the Hawaii exemption and there IS an NCAA rule preventing FBS teams from scheduling games before the extended Labor Day weekend. Any team that plays at Hawaii has the OPTION of playing an extra 13th regular season game AND/OR a game during week 0. Some teams choose to and some don't but not just anyone can schedule a game in week 0 as some have suggested.
To counter jaminniner's argument:
1) Hawaii is by default always allowed to play a home game in week 0 (because of the opponent travelling there) and they also get the same reverse consideration for travel involving themselves. So the Hawaii-Colo St. game in Fort Collins, CO can be played in week 0 because the travel exemption/13th game allowed for Hawaii this year.
2) The New Mexico State-Wyoming game can be played in week 0 because Wyoming plays at Hawaii on October 6. Wyoming chose not to play a 13th game but that does not prevent them from playing in week 0, which they chose to do. New Mexico State is allowed to play in week 0 by default because they play Wyoming (which plays at Hawaii) but NMSU is
not allowed to play a 13th game because they don't play at Hawaii directly.
3) Rice-Prairie View is allowed in week 0 because Rice plays at Hawaii on Sept 8. Rice chose to play in week 0 and have a 13th game, which they have every right to do. Rice could have scheduled another opponent in week 0 (like another C-USA school) but chose to play PV. Just my opinion, but with a week less time to prepare for the first game I bet you'll rarely see teams schedule conference games in week 0 (like Haw-CSU) even though they can.
4) UMass is allowed to play Duquesne because the Dukes play at Hawaii on Sept 22. Like the NMSU example above, UMass is allowed to play in week 0 because of Duquense but can not play a 13th game because they don't play at Hawaii directly.
If anyone wonders this rule is in place to incentivize teams to travel to Hawaii, since it may be difficult for them to fill their OOC schedule otherwise.
One other question...how can so many people have access to the internet yet not have the ability to look up something so simple?!