
The challenge encourages nominated participants to be filmed having a bucket of ice water poured on their heads and then nominating others to do the same. A common stipulation is that nominated participants have 24 hours to comply or forfeit by way of a charitable financial donation.
On August 1, 2015, a group of ALS organizations in the United States, including the ALS Association, Les Turner ALS Foundation, and ALS Therapy Development Institute, re-introduced the Ice Bucket Challenge for 2015 to raise further funds with the intention of establishing it as an annual occurrence. It failed to raise the same viral attention as the original event, which raised over $115m worldwide for the disease in 2014 alone. However some people—including celebrities and various government officials around the world—have followed through with the intention of a yearly event by continuing to perform the challenge again each subsequent summer.