Mic Night

Clopen* Mic Night is a mathematical variety show featuring mathematicians, performers and maths communicators bringing you a random** selection of comedy, music, art, demos and puzzles to share and showcase their love of mathematics.

Clopen Mic Night #4: Chestnuts Roasting on a Clopen Fire took place on Tuesday 19th December 2023. You will be able to watch the show live or watch a recording of the show for a limited time on the Clopen Mic YouTube channel. More details can be found on the events page.

Clopen Mic Night happens on a semi-regular basis, live on YouTube, with audience interaction in the YouTube Live Chat and a selection of four acts to enjoy. The first Clopen Mic Night took place as part of the 2021 Talking Maths in Public conference, on Thursday 26th August. Details of our shows can be found on the events page. You can sign up below to receive an email before our next event.

The show is free to watch, but we support our performers and pay our behind-the-scenes team for their work, so if you’d like to make a contribution - for example, as much as you’d pay for a ticket to a show - you can do so at any time by visiting or Clopen Mic Night is brought to you by the creators of the 24 Hour Maths Magic Show, in partnership with Talking Maths in Public.

The show content will be aimed at an adult audience but the level of maths content should be accessible to anyone aged 14+.

We’d like this event to be fun for everyone, so we have a code of conduct: don’t engage in exclusionary behaviour or language, harassment, bullying, aggression or elitism, or make exclusionary jokes - not even ironically. Use gender-neutral language where appropriate and respect people’s pronouns. This event is aimed at adults, so there may be some swearing. If you have any concerns you can email us at

If you want to perform a piece of comedy, music, or art, do a demo, discuss a puzzle, or do anything else at a future Clopen Mic Night, then we’d love to hear from you. You can find more information about performing on our backstage page.

* Clopen is an incredibly niche mathematical term for something that is both open and closed at the same time. If you'd like more information, find a friendly mathematician and ask them to tell you about it.
** Random is a fairly well-known mathematical term which means something is chosen as if by chance from some specified distribution such that examination of a large set of such items reproduces the underlying distribution.