The public-event version of the instructions, which is stricter than the business version.
Siting and supervision
At a business the balloon is in a corner of a lot behind a fence. At a school it is on a field with children running past it.
Site the tether point away from foot traffic, weight it properly, and give one named adult responsibility for it, including the decision to bring it down. Net lift is only about three pounds, but a line at ankle height in a crowd is a trip hazard regardless of what is on the other end.
The wind rule, treated as firm
Winds over 25 miles per hour in the forecast means it does not go up, or it comes down.
At a business that rule protects an investment. At a school event it protects people, so treat it as non-negotiable. The committee that has been planning for months is exactly the group most tempted to fly it anyway.
Helium handling
Helium is inert, so the hazard is not fire. It is the cylinder: full ones are heavy, and one that falls and snaps its valve is genuinely dangerous.
Keep it upright, strapped or chained, capped when not in use, and fill outdoors or somewhere well ventilated. Your gas supplier will run through this when you open the account. Let them.
Airspace
Below 150 feet above ground the FAA is not involved and we fly at 120 feet.
Within five miles of controlled airspace, call the local tower and ask. School fields near regional airports catch this more often than people expect. It is a short call and in forty years we have never been refused.
Storage between seasons
Deflate it, fold it at room temperature, and put it back in the carton. Somewhere dry, not damp.
That is the whole procedure. Nothing to service, nothing to replace, and polyurethane tolerates the cycle indefinitely.
More at arizonaballoon.com.