There is one festival, which is marked as a religious notification of Tulsi Devi, and this ceremony is marked as Tulsi Vivah. It is primarily considered as ceremonial marriage of Tulsi plant, to Hindu Lord Vishnu. This Vishnu is performed at any time frame, between Prabodhini Ekadashi. Usually, this ceremony is performed on 11th or 12th lunar day. it varies from one region to another. This wedding is a mark, which signify end of monsoon and beginning of special Hindu wedding season.
Places where it is worshipped most
Practically, Tulsi Devi is worshipped in every Hindu State, all over India. There is no particular area, where Goddess Tulasi is worshipped majorly, as it marks peace and serenity in every household. Majority of people place this Tulsi plant in their front yard or on roof. Even though, people from various areas believe in Tulsi Devi, but rural people mainly devote their time for this ritual.