Something I liked immensely from a conference that dealt with under-represented people in tech is that a lanyard colour denotes whether or not you can be photographed.
i.e. a blue lanyard means that you can be photographed, and a red/pink one that you cannot be photographed (these colours survive most colour blindness too)
i.e. a blue lanyard means that you can be photographed, and a red/pink one that you cannot be photographed (these colours survive most colour blindness too)