Akal Takht jathedar Giani Raghbir Singh on Monday called the meeting of Sikh clergy on December 2 to pronounce the much-awaited tankhah to Shiromani Akali Dal president Sukhbir Singh Badal. The mistakes cited by the rebel leaders include the revocation of the blasphemy case against Dera Sacha Sauda chief Gurmeet Ram Rahim for imitating Guru Gobind Singh in 2007; the …