Accross the bridge
By how you walk up or down to talk, by how you smile and open your arms toward them and come closer, how you look at the eyes with direct warm contact.
Before you begin your first word.
They have to feel you are authentic, yourself, sincere and happy to be there, by your stance, attitude, attire and walk toward the place you will be speaking.
I will speak later of the great new book I just received, and begun to read "the naked presenter".
Yes, it means mostly you have the courage to be vulnerable and there in the present. If not literary naked, but emotionally open.