The UFC usually does a good job of building cards based off the demographics of the host city. Maine is very white without a strong foreign born population or much in the way of ethnic diversity. I think the UFC will look to fill the Maine card with fighters from Quebec (Francis Carmont if he comes out of the Dolloway fight unscathed maybe?) and the tri-state area (although a lot of those guys will be on the New Jersey card earlier in the summer).
For the Oklahoma card, you can bet your ass the UFC is planning on Hendricks headlining if at all possible. He was supposed to be able to return to training this month which would line up well with an August fight date. Maybe against the winner of Woodley-Rory? If the winner of that fight can't turn around quick enough, and with Lombard-Dong and Brown-Lawler otherwise being tied up with late Summer matchups of their own, maybe Nick Diaz?