In the USA, you need an FDA variance to operate one at events. https://www.proxdirect.com/support/variance https://www.proxdirect.com/support/variance has some

In the USA, you need an FDA variance to operate one at events. https://www.proxdirect.com/support/variance https://www.proxdirect.com/support/variance has some info but the most important parts are: - 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 Related standards: - 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) https://www.lasershowsafety.info/us-laws.html https://www.lasershowsafety.info/us-laws.html has more info including some about how to possibly do audience scanning with special equipment, but you can see from all of these rules why it's a lot easier to just avoid lasers for events and clubs. Pyrotechnics are a lot of red tape too.