The events of Ashura lived on thanks to Imam Sajjad and Lady Zaynab’s endeavors, explanations and revelation of reality
If Zainab Kubra (a.s.) and Imam Sajjad (a.s.) had not fought, or revealed and interpreted the truth of Ashura's philosophy, or the purpose of Hussein ibn Ali (a.s.) and the enemy's oppression during the days of captivity--in the evening of Ashura in Karbala, in the following days en-route to Sham and Kufa, and in the city of Sham, then on the pilgrimage of Karbala, and while moving to Medina and during the many years that these great figures lived--the event of Ashura wouldn’t have survived and remained as vivacious till this day.