If the goal is to actually help people then I would work with at risk youths. The power to actually read minds would give me better insight into how to get across to them. Putting on some stage act is an ego driven endeavor and Im not sure how youre not supposed to make money by actually reading peoples minds but making it look like a douchey parlor trick at the same time. Pull two random people on stage, stand between, facilitate a conversation by proxy, the two strangers remain silent but you read their thoughts out loud to them (and the crowd) bouncing back and forth as if they are speaking through you. The strangers facial expressions should do much to convince most. To convince the rest just make one of them cry. Wear eyeliner, rinse, repeat.