I)ark_Seph's post in How to add crowd events was marked as the answer
@@Xaphist Look on Section 9 of this thread. It gives more details about each one and how to add them: http://customsforge.com/topic/30557-guidelines-for-official-looking-customs/?p=219855
Be sure to set as "Rocksmith event marker", and forget about the errors you may get. It will already be in your xml file.