With kids going back to school, here’s a relatable idea for your entire audience. Have kids call a special phone line you set up (could just be your direct extension at the station) and give them 30-seconds to tell you what they did while on their summer vacations. Invite parents do do the same thing. Kids are always cute and the disparity against the adults will be amusing. The more you promote the line (on your show and throughout the day) the more you’ll get to air. This is better than a straight up phone topic because you won’t be at the mercy of what you just get that morning if you roll it out then.