Meta smart glasses in particular are known for their LED.
So DEF CON has restrictions for photography, but as long as you do not hide your smart glasses' activity LED, you can just walk around and record everything as audio and video?
Full text at https://defcon.org/html/links/dc-photo-policy.html:
«Smart glasses and other devices that can record audio or video with no consistent way to understand if they're recording or not, are prohibited at DEF CON, they erode trust and invade people's privacy.»
(Last paragraph. The other paragraphs refer to photography.)