I live in the Denver area and go up to Black Hawk / Central City about 6-8 times per year (and have been doing this for years). Although I can't say anything conclusively, I would say that I can't recall seeing any type of Omaha 8 game running. The biggest room with most games spread is the Ameristar, but they do not run any tournaments at all. If an Omaha 8 cash game were to run, it would be here. You might monitor their activity on Bravo Poker Live. I haven't played at the Ameristar in years. They have long wait lists and the common practice is to call before you leave your house (average drive from the Denver area is just under an hour, although this is highly dependent on what part of Denver you live in). Just not a fun of the room or that system.

Golden Gate in Blackhawk will play occasionally I would suggest starting an interest list when you arrive if the right players are in the room it will start weekends are the best time to go but games are always running, mainly one two to $100