Tulsi Vivah, the ceremonial marriage of Lord Vishnu and the Tulsi plant, is widely observed on Kartik Shukla Dwadashi. While some celebrate on Dev Uthani Ekadashi, this year it primarily falls on November 13th. The article provides a comprehensive guide for performing Tulsi Vivah at home, detailing necessary items, cleansing rituals, decoration procedures, and essential mantras for a fulfilling observance.