I agree. The real explanation of a Key party via Urban Dictionary is:
http://www.urbandictionary.com/defin...term=key+party
A couples party where all of the men put their car keys into a bowl or bag and at the end of the party, the women blindly select a set of keys to determine who she goes home with for the rest of the evening for sexual gratification.
So in our case it would be:
A party where all of the Women put their hotel keys into a bowl and at the end of the meet/greet, the men blindly select a set of keys to determine who he goes to visit with for the next hour of the evening for gratification.