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I'd suggest going with a Snell SA rated helmet, not an M rated one (SA is for special applications - i.e. road racing, while M is for motorcycle). You'll pay more for an SA helmet but it should be more widely accepted.
I've needed SA rated helmets for track days, my local BMW Club chapter and another local organizer don't allow M rated helmets. I'd go with a full helmet, open face helmets have been allowed for events I've attended but I don't see the advantages given the reduced protection.
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