Just post an event when ever you want to schedule a session. Either that or we can use a google doc to post when you're free.
https://docs.google.com/spreadsheets/d/1We5IZjnanJb_bC6xywhPhUOruBxxqCponnPdeWOu6VU/edit?usp=sharing
Click down the bottom on the month tabs to add times etc. I put some examples.