It's VERY dififcult question to answer .
Because they change it time to time .
And they cancell it without notice or just don't have it for only one night for some reason .
For instance , 39 UNDERGROUND has " ALL DAY , EVERYWHERE naked concept " on Tuesdays , but they didn't have it soon after the iTV report on TAWAN's fuck show .

As I am a regular of 39 , I can say they still have NAKED TUEDAY , but they no longer have naked zone on Mondays .
Now they have changed it " Underwear night " .
They still have regular NAKED NIGHT " on Wed ( 3rd and 4th floor , and THE LOOKOUT )

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