Ahmedabad, Jan 10 (ANI): Congress party has called for a shutdown on Saturday in Gujarat protesting against the ruling Bharatiya Janata Party's proposed "Vibrant Gujarat Summit" beginning Sunday. Congress activists have been holding protests at important government installations across the state. Dozens of Congress activists held a protest outside the Income Tax department in Ahmedabad city before they were detained by police. A Congress activist Ketan Rawal said the government was holding the summit to attract investments in the state at a time when it had failed to tackle important issues. The summit, which is an annual event, was the brainchild of Narendra Modi when he ruled the state before becoming prime minister last year. The ruling BJP slammed the Congress for organising protests accusing it of putting brakes on development.