Definition: Purab is an anniversary commemorating either birth or death as a holiday festival. But a Gurpurab is a holiday commemorating either the birth or death of one of the ten gurus of Sikhism. A gurpurab is observed with festivities which involve a worship service: * An akhand paath, a 48 hour continuous reading of the Sikh scripture Guru Granth. * Singing hymns during an early morning worship service. * Singing hymns during a daytime or evening worship service. * A parade of the scripture, Guru Granth, accompanied by a procession of worshipers singing hymns. * Singing hymns in an all night worship ceremony * All of the above including fireworks displays over a 3 day period. Pronunciation: purr rub. You must mean Gurpurb: A Sikh festival celebrating a special event associated with the lives of the gurus.
Gurpurbs are days that commemorate the births and deaths of the Gurus. Just like Christmas for Jesus
The main Sikh celebrations are Vaisaki, Hola Mahala (Holi), Diwali and the Gurpurub's (Gurpurub - birth or death of a Guru.)