If this has piqued your interest, there are some (but not lots) of paid options for things like this, e.g. - (San Francisco) afterschool math team for 7-11yo k

If this has piqued your interest, there are some (but not lots) of paid options for things like this, e.g. - (San Francisco) afterschool math team for 7-11yo kids: https://www.meetup.com/chess-games-inner-fire/events/295637257/ https://www.meetup.com/chess-games-inner-fire/events/2956372... - (San Francisco) afterschool math circles at a couple of SFUSD schools: https://www.sfmathcircle.org/jose-ortega https://www.sfmathcircle.org/jose-ortega https://www.sfmathcircle.org/starr-king https://www.sfmathcircle.org/starr-king - (Remote) 501(c)(3) nonprofit running weekly online competition math sessions for elementary and middle school students: https://mrmathonline.com/ https://mrmathonline.com/ If you're looking for something in between classes and circles, then perhaps: - Engaging Math Circles (https://emc.school https://emc.school) - Russian School of Math (RSM)