Stand up to the white board

Doesn't matter if you called the meeting.

Doesn't matter if you are the most senior person in the room.

You don't need to be leading the meeting.

To add oxygen to any group discussion, stand up and grab a marker.

If you aren't leading, take notes. ("I'll just capture these action items that we are deciding.")

If you have an idea, sketch it out. ("What if we structure the problem this way?")