Diya Aur Baati Hum

Meenakshi is in a dilemma about the blackmailer and hides a jewellery to be given to him in a laddoo. This she takes when Mohit distributes laddoos in celebration of an event at home. Sooraj expresses to Sandhya. Vikram also professes his love for Meenakshi. What is the celebration for?