Take steps to properly hydrate and chill out
The combo of high-energy dance music and “rolling” can be dangerous without taking precautions. That’s because MDMA (and Methylone, which is one of the most common things in Molly), and Methamphetamine all work in part by increasing your heart rate and blood pressure and body temperature. Dancing for hours uninterrupted by breaks, especially in hot temperatures and with other people packed together does the same thing. It’s this combo of raving and rolling that can potentially be lethal.
To increase safety, there needs to be chill out rooms, free water readily available, and a lot of outreach and education. People need to be instructed to take breaks, drink water or electrolyte solutions, not alcohol or energy drinks, and also not too much water, which can be dangerous. Try to only replace fluids lost by sweating.
Make sure your friends are okay
This may be stating the obvious, but LOOK OUT FOR YOUR FRIENDS and never let someone wander alone. Drink water and replenish electrolytes. Take breaks and cool down. Communicate with someone around you if you start to feel overwhelmed or are having a difficult experience. If someone around you seems fatigued, confused, or is having a difficult time breathing and/or standing on their own two feet, get them somewhere safe to sit and cool down. Seek onsite medical personnel.