I wanted to make a list of places that had slot machine tournaments near Texas. I think since the bingo-based slot games in Oklahoma are Class III games, they don't really hold tournaments there, so Louisiana would be the closest place to go to find any slot tournament action. There are only a couple of casinos currently offering slot tournaments there, as far as I know, and they are:

Delta Downs in Vinton - They hold a free slots tournament every Thursday and Sunday with a $500 prize for first place.

Harrah's Louisiana Downs in Bossier City - They hold slot tournaments every Wednesday and Thursday with a $10 entry fee. Entry is free if you're a Diamond, Platinum or Seven Star member. The prize is $1500.

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Slotty McSlots