flutter the dovecote

To cause a stir or mild disturbance among a certain organization or group of people, especially one that is typically quiet, reserved, or conservative in nature. Likened to domestic pigeons fluttering their wings in response to an agitation (a dovecote being a structure built to house and raise them). The exuberant young woman fluttered the dovecote of the old Men's Only club by bursting in unannounced.