The fourth edition of India International Science Festival (IISF) will be held in Lucknow, Uttar Pradesh. The exact dates and other details will be decided later. The 1st IISF was held at IIT New Delhi in December, 2015. The mega S&T expo attracted more than 3 lakh people. India had also set a Guinness Book of World Records, when 2000 school students performed two experiments at the Festival. The 2nd Festival at CSIR-National Physical Laboratory, New Delhi in December 2016 showcased Indian achievements in various fields of science and technology. The third in the series was held in October 2017 in Chennai.