From 7 January to 4 February and from 7 March to 1st April.
Chamonix Tourist office are offering free lessons this winter for guests in town staying a minimum of 3 nights. Organised through the ski schools the ski lessons are available for any level of ability, any age and any type of skiing. Sounds like it includes off- piste and ski touring. You may even want to give telemarking a go?
Check availability here.
Details of How to Book the lessons is now available Here.