Unless your following a preset routine which has become standard for the event go with your instincts. Your the professional they hired. I'm so tired of people "telling" me what they think will work and when you get to the actual job it never works. Do what you think will fit in without becoming overbearing.
I'm sure your experienced enough to "read" an audience and situation which is one of the most valuable talents a performer can have.
Have a great job.