Ask questions, meet dancers, and be part of the conversation.
If we resist the tempatation our soul becomes sick for desire.
As long as you realize that instructors are at a social as a paid business situation, and not for the same reasons you are, then go ahead and 'dance' with the instructor. Otherwise, please remember that the instructor dances at an entirely different plane than you do, has his own social circle, and is there for the money. The salesmanship of a techer at a social cannot be underestimated, even if the teacher never says a word to the student about more lessons...