The Umrah pilgrimage is extremely important; it is the Islamic calendar's second most sacred event, occurring shortly before the Hajj trip in the month of Dhul al-Hajj. The Umrah pilgrimage is unique in that it can take place at any time of year. You can't just go on an Umrah pilgrimage, there are rules, limits, and other requirements that must be met in order to obtain an Umrah visa.