To wish someone in Sanskrit for Diwali, here is a greeting suggested by our Sanskrit scholar, Shri Gavish Dwivedi:
भवद्भ्य: दीपोत्सवस्य अनन्ता: शुभकामना: ।
Many Greetings to you on the occasion of Deepotsava.
How does one respond to this?
A good response is:
भवद्भ्य: अपि शुभकामना:
So go ahead, wish your friends and family in Sanskrit now! 🙂