Those two guys look like security / FBI / cops.
They are wearing the exact same outfit. The one clearly has an earbud in only 1 ear. The other one (less pictures, lighter skin tone) has a picture where he is adjusting something on the same ear.
They also appear to have badges for the event.
They're not wearing anything which can't be purchased anywhere online by anybody. Probably a better way to fit in, and have gear on without being questioned.
Less obtrusive than wearing a full beard, keffiyeh, and thawb.