HowTheLightGetsIn Festival is the world's largest philosophy and music festival, hosted by the Institute of Art and Ideas. It aims "to get philosophy out of the academy and into people's lives" by bringing together philosophers, writers, academics, comedians and musicians for a festival of debate, talks, music, workshops, and late night parties.

Speakers at the festival have included Noam Chomsky, Brian Eno, Ed Milliband, Kimberlé Crenshaw, Philip Pullman, Diane Abbott, Robert Skidelsky, Stanley Fish, Steven Pinker and Laurie Penny, among others. Music headliners have included Clean Bandit, Hot Chip, and Donovan. Comedians have included James Acaster, Sarah Pascoe, and Phil Wang.

HowTheLightGetsIn is hosted twice a year. In May, the festival is found in Hay-on-Wye, Powys, Wales. Held at the same time as the Hay Festival, HowTheLightGetsIn attracts a footfall of over 30,000 each year to its riverside setting by the banks of the River Wye. The September festival is held in Greenwich, London, and has been running since 2018.

In May 2020, HowTheLightGetsIn launched its first fully online festival which was well received with pre-sale tickets selling out in 76 minutes.

This online festival will include 200 events on eight stages, live streamed from Delhi, London and New York, with the aim of giving the festival global reach and making it accessible from all time zones.

According to en.wikipedia