Every August 15, Mumbai's running community comes together in a feat of both physical endurance and mental strength. The day is marked as Ultrathon day, a running event that covers a distance longer than the traditional marathon's 42.2 km. This time around, the Mumbai Ultra organisers, instead of the run, are holding a 12-hour blood donation camp at the Savarkar Smarak ground, Shivaji Park.

For the annual ultrathon, runners pound the streets beginning from outside Swantantrya Veer Savarkar Rashtriya Smarak at Shivaji Park, going towards Worli Seaface and back, completing one loop. In this way, they run for 12 hours in total, completing loops of the course.