Would they have given you any trouble for wearing a helmet on a tourist day?
6 months ago or so, probably not, which is why I always wore a helmet out there. But lately they've been having issues with novices going out there in ill-equipped cars not knowing what they're doing, but still trying to set lap records and either crashing or just being a hazard to other drivers. Therefore, they've cracked down on things like helmets, in-car timers, data loggers, etc.