 A Gurpurab is a mixture of the religious and the festive, the devotional and the spectacular, the personal and the communal.Over the years a standardized pattern has evolved, but this pattern has no special sanctity, and local groups may invent their own variations.During these celebrations, the Guru Granth Sahib is read through, in private homes and in the gurdwaras, in a single continuous ceremony lasting 48 hours.