For the past four months, 27-year-old dentist Tanu Shreya has spent every spare minute planning her upcoming wedding. From accessories to match a fresh outfit for each of the four days of celebrations, to personalized gifts for hundreds of guests, her family has been out shopping every weekend since the date was finalized in August. Shreya’s ceremony in the eastern state of Jharkand is one of the 3.5 million nuptials planned between the end of November and mid-December. The wedding industry in India is estimated to be a $51 billion opportunity as it continues to grow rapidly.