Was in Vegas last week of January and Aria is your best bet for higher stakes PLO. However with the Venetian having their deepstack tournament good chance of a game of PLO starting in the early afternoon. Only rooms worth going to for PLO are the two mentioned and Bellagio good luck. All three are on the Bravo network used the app while I was there very useful.
jealously anyways i always saw PLO activity when i was grinding the DSE at Venetian. mostly 1/2 i think but the stacks were retarded and ppl dump 1k easy there because the max buyin is pretty big.
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There's a DSE going on as well
Bellagio typically has the bigger PLO games running on weekends but not sure how big during the week.