It's in the general rules, it's for any event.
I just looked under "General Rules" and "Identification". It says there may be other requirements in other sections of the rules, but calls them "additional", and does not call them "alternative". Supposed to have the AMA number or name and address of the owner. There, it also spells out a few exceptions...Indoor FF models, presumably microfilm, where it's ok to omit, and scale, where it's supposed to be enclosed internally somewhere unspecified. As I see it, the "N81H*" allowed in the pylon racing rules is only allowed for those events. *For my number & last name.
Maybe I'm not finding the appropriate section of the General Rules? Or did you mean the CL General Rules? Nothing there. I just looked in the Table of Contents of THE General Rules. It's on "23"...page, I guess. I'd really like to know, being a semi-ex-professional CD.