Something that has been working for me:
Once I get the first guy in a group to go for a dance, I bring him back and say something like "Joe was a perfect gentleman. Can you believe that guys? I guess there is a first for everything..... so Joe, who would you recommend I dance for next? Should I dance for John or Bill? Bill... why? Well that is good enough reason for me. Let's go, Bill!"
And then repeat when he comes back.
When a guy suggests his friend get a dance, 99% of the time, the friend will go. It's awesome.

