KATHMANDU: The central committee meeting of the Nepali Congress on Thursday failed to fix the date of its 12th General Convention. The meeting of the office bearers had decided to propose June 10 to 14 for the GC. However, CC members on Thursday objected to the proposed dates. They said the GC should take place before the promulgation of the constitution. The party has already postponed the dates for holding the GC four times earlier.