In Jainism, "Kalyanak" refers to auspicious events in the lives of Tirthankaras, such as conception (Garbha Kalyanak), birth (Janma Kalyanak), renunciation (Diksha Kalyanak), attainment of omniscience (Kevalgyan Kalyanak), and liberation (Nirvana Kalyanak). "Vad Satam" is a date in the traditional Jain/Vikram Samvat lunar calendar, corresponding to the 7th day of the waning (dark) half of the lunar month.

To determine which Kalyanak, if any, falls on Vad Satam (15/08/2025), one would refer to the Jain Panchang (calendar) for that specific year. These Panchangs are prepared annually by Jain scholars and list all significant Jain festivals and Kalyanaks.

As of now, based on standard Jain calendars, there is no widely celebrated Tirthankara Kalyanak that universally falls on Vad Satam (15/08/2025). However, specific temples or Jain communities may observe local celebrations or anniversaries on this day.

For precise observances, please consult the Jain Panchang or your local Jain Sangh for 2025. If you have a specific Tirthankara or event in mind, please provide more details.