Crowd safety during Ashura and Arbaeen
Ashura and Arbaeen bring extraordinarily large crowds into a relatively concentrated area around the shrines, which is the biggest practical safety factor for most pilgrims, more than any other single risk. Stay close to your group, agree on a clear meeting point in case you are separated, and keep your phone charged with your group leader's number saved and also written down on paper in case your phone battery runs out.