Simon Singh (author of The Simpsons and their Mathematical Secrets among other books) and founder of the Parallel maths website parallel.org.uk with weekly activities for bright mathematicians is starting a free weekly online 'maths circle' event where you can watch and interact with him and guest speakers.
Events will be for 9-11, 11-13, 13-16 and 16-18 year olds, starting this Sunday 12th June.
Kids just need to sign up for a free account and then log in at the right time. No tickets needed. parallel.org.uk/circles