whether it would be taxable or not? Fundamentally no. Such activities are often done as fund raisers and are normally not seens as business.
But if the income-tax department treats such receipts as business income and if the charitable trust is involved in "advancement of any other object of general public utility" , then the maximum revenue from such activity can be Rs 25,00,000. If the income exceed Rs 25 lakh, the trust will lose the exemption.