How to promote teaching yoga for Wednesday afternooon kid's groups?


I would like to set up a class to teach yoga to children during their Wednesdays when they often do extra curricula activities. I heard that there is a meeting with all the possible options children can chose between, where they can register for a course for a year. I also heard that if you miss this (which I may have done now for this year) then the children are already committed and so not many are going to enrol during the school year. Does anyone know about this please,or for that matter, know about someone teaching yoga to children who I may be able to contact?

I am in the South Dordogne, on the border between the Lot and the Lot et Garonne.

Thank you, all suggestions appreciated, Carol