Answer

If you mean the Jain term for the birth of the 20 Viharman Bhagwans, it is called Janma Kalyanak. The 20 Viharman Bhagwans are the presently active Tirthankaras associated with Mahavideh Kshetra. ( oshwal.org.uk)

Explanation

In Jain tradition, “Viharman” refers to the 20 living Tirthankaras believed to be currently present in Mahavideh Kshetra. Their auspicious birth event is called Janma Kalyanak. ( jainismknowledge.com)

Takeaway

So the short answer is: 20 Viharman Bhagwans’ birth = Janma Kalyanak. ( oshwal.org.uk)