I wouldn't be surprised that a date rape drug might have been tried based on the information that has come out however, if it was done, it leads to more questions:
1) As was mentioned, why would somebody in the sex trade not be wise to this and refuse food and beverages that are offered? And is there any evidence that she drank anything at the party?
2) The reason you'd drug somebody is to make them compliant so why was it necessary to beat her and strangle her? A drugged victim wouldn't be putting up much of a struggle, you would think.
3) If there was intent to drug and rape the dancer, why just one dancer? Wouldn't they have offered Kim the same stuff?
4) Does it fit the timeline mentioned in other parts of the scenario. IOW, was there enough time for a drug to be administered and to take effect between the time she re-entered the house and the time needed for three men to rape her?
I suppose it is all possible but it needs to piece together correctly.
There are a gazillion reports on the net about date rape drugs, their effects, etc., etc.
This may have been somebody's idea of a joke.