A technique utilizes a smartphone during a public address system session. The technique involves operating a public address system to provide audio from a local human presenter to a local human audience, the local human presenter and the local human audience residing at a common physical public address location. The technique further involves establishing, while operating the public address system to provide audio from the local human presenter to the local human audience, an electronic connection between the smartphone and the public address system. The technique further involves providing, after establishing the electronic connection between the smartphone and the public address system, audio from a user of the smartphone to the local human audience through the smartphone, the electronic connection, and the public address system.