LAHORE, Mar 20 (EW): Pakistan Tehreek-e-Insaf (PTI) Chairman Imran Khan announced on Sunday a “mega power show” at Minar-e-Pakistan in Lahore on Wednesday, the eve of the Pakistan Day celebrations. Addressing his supporters via video link from his Zaman Park residence, Imran vowed a “mammoth rally” at Minar-e-Pakistan, which he said would be like a referendum to prove which …