NEW DELHI: The Centre has called for a special session of Parliament for five days between September 18 and 22.According to sources, "One Nation, One Election” is likely to be one of the key legislations to be taken up during the special session next month.The proposed legislation aims to provide for the simultaneous conduct of Lok Sabha as well as state assembly elections. So far, there has been no word on the official agenda of the session which will be held days after the G20 summit in the...