holy Sikh scripture, which is placed on a float. Band Chor Diwas has been another important Sikh festival in its history. In recent years, instead of Diwali, the post-2003 calendar released by SGPC has named it the Bandi Chhor divas. Sikhs celebrate Guru Hargobind's release from the Gwalior Fort, with several innocent Raja kings who were also imprisoned by Mughal Emperor Jahangir in 1619. This day continues to be commemorated on the same day of Hindu festival of Diwali, with lights, fireworks and festivities. Hola Mohalla is a tradition started by Guru Gobind Singh. It starts the day after Sikhs celebrate Holi, sometimes referred to as Hola. Guru Gobind Singh modified Holi with a three-day Hola Mohalla extension festival of martial arts. The extension started the day after the Holi festival in Anandpur Sahib, where Sikh soldiers would train in mock battles, compete in horsemanship, athletics, archery and military exercises. Gurpurbs are celebrations or commemorations based on the lives of the Sikh Gurus. They tend to be either birthdays or celebrations of Sikh martyrdom. All ten Gurus have Gurpurbs on the Nanakshahi calendar, but it is Guru Nanak and Guru Gobind Singh who have a gurpurb that is widely celebrated in Gurdwaras and Sikh homes. The martyrdoms are also known as a Shaheedi Gurpurbs, which mark the martyrdom anniversary of Guru Arjan and Guru Tegh Bahadur. Ceremonies and customs Khalsa Sikhs have also supported and helped develop major pilgrimage traditions to sacred sites such as Harmandir Sahib, Anandpur Sahib, Fatehgarh Sahib, Patna Sahib, Hazur Nanded Sahib, Hemkund Sahib and others. Sikh pilgrims and Sikhs of other sects customarily consider these as holy and a part of their Tirath. The Hola Mohalla around the festival of Holi, for example, is a ceremonial and customary gathering every year in Anandpur Sahib attracting over 100,000 Sikhs. Major Sikh temples feature a sarovar where some Sikhs take a customary dip. Some take home the sacred water of the tank particularly for sick friends and relatives, believing that the waters of such sacred sites have restorative powers and the ability to purify one's karma. The various Gurus of Sikhism have had different approaches to pilgrimage. Upon a child's birth, the Guru Granth Sahib is opened at a random point and the child is named using the first letter on the top left hand corner of the left page. All boys are given the last name