It's a matter of taste, of course, but the event does not look incredible to me.
- Laser projector must be mounted and have the lowest point on the beam at least 10 fee above the floor and 10 feet horizontally from anywhere a person could go -- this is why many laser shows just do "laser sky" effects that are just projecting wide horizontal lines even though they can do up/down effects as well
- beam must be terminated into something non-reflective -- can't shoot it off into the sky
- absolutely no scanning the audience -- again, the lowest point of the beam has to be at least 10ft above the floor
- ANSI Z136.1* ‘Safe Use of Lasers’ (currently available, but general for all laser use)
- ANSI Z136.10* (to be published shortly, but specifically covers laser light show safety)
I used to be a member of ILDA [1], which developed a number of the protocols, serialization formats, and safety measures. They'll certify hardware and operators, and they'll kick out members that engage in crowd scanning. They don't really have much of an enforcement mechanism, though.
In the US, the FDA and FAA have regulations on laser displays [2]. You're supposed to apply for variance, but many smaller venues and operators skip this outright.
It can be incredibly dangerous if care isn't taken. These multi-watt lasers can easily burn holes into things, with your tissues being among the easiest.
These folks were clearly crowd scanning at eye level.