Regardless of how powerful and positive your message is, if you do not pick the right spokesperson and location, it will not reach the ears of your intended audience.
Pick an appropriate location to deliver your message.
Think about the length, content, and all other features of your message, and pick the location with the most conducive environment to deliver it in.
Pick an appropriate person to deliver your message.
Think about the intended audience of your message. Who would they be more likely to listen to?