In Agora, you always have a role, even if that role is that of an audience member. Why? Because Agora Speakers Clubs are expected to be friendly, supportive and safe environments for practicing public speaking. The speakers are not experts; most of the time they will be extremely nervous and self-judgmental. Sometimes they will have self-esteem or confidence issues, even if they are not immediately apparent. Sometimes they will have extreme shyness and even the mere fact of standing in front of a group of people and saying a single sentence could be an ordeal for them. They will take anything that could be remotely seen (or imagined!) as negative and blow it out of proportion in their minds.
Don't be fooled by their credentials or past experience - nervousness and self-judgment is something you will never get rid of, you will only learn to accept it, control it and channel the energy that it generates in a positive and useful way.
All this means that the audience has also a role to play - to support, to be positive, to be respectful and to exercise restraint and tolerance.
To be supportive and to be positive means participating in applauses, listening carefully to speakers, looking at them in a supportive way and in other similar small expression of friendliness..
To be respectful is expressed in common sense good manners, such as not talking to your neighbors during a speech, not checking your phone every two minutes, etc.
Finally, to exercise restraint and tolerance means that you should hold back your desire to shout back, interrupt or make negative or disproving gestures at the speaker when he's talking about a subject with which you deeply disagree - religion, politics, social issues ..maybe even football..