Swaying large crowds to your point of view can be a daunting task. Orating to a government assembly, cooperate committee, or social club audience are all good examples of this. A preacher seeking to convert others is also done through an oratory check.
The Prepared Speech: A speech can be written ahead of time. If applicable, the speech writer can first make a Lore:[area] check – success means local references and reading level will infuse the speech for a +2 bonus on the speech writing check. The speech is written using a language check. If the check is successful, it gives the Persuade check a bonus equal to the RC of the language check. The GM may wish to impose a penalty if the speech maker is noticeably reading from a script; or they may give a bonus if its been memorized and seems impassioned and spontaneous.