Start with one live decision point
Most presentations fail on participation because interaction gets saved for the end. A better starting point is one decision point early in the session.
Use a live poll to ask the room where they stand before you explain the topic in depth. That changes the audience from observers into contributors.
Use visual feedback to guide the next slide
When poll results or open responses appear live, the presenter has a reason to adapt. That adaptation is what makes the interaction feel real.
Even a simple follow-up like comparing the room split before moving on makes the experience more participative.