I like this from Miriam Skinner on surprising people with the gospel at the end of an event.
Jesus is the bee’s knees, the cat’s pyjamas, the most incredible social and political radical the world has ever seen. He’s good news to the poor, freedom for the captives. We certainly don’t need to employ an awkward quiz at the student union bar to make him more digestible.
Replace “an awkward quiz at the student union bar” with “battle of the bands at the school hall” if you need to.