New Delhi, Nov 24 The primary market is expected to remain vibrant, with at least 10 companies, including supermart major Vishal Mega Mart and Blackstone-owned diamond grading firm International Gemmological Institute Ltd expected to raise a combined ₹20,000 crore in the next month, merchant bankers said. Education-focused NBFC Avanse Financial Services, TPG Capital-backed Sai Life Sciences, hospital chain operator Paras …