Open the Triptherapie group sessions in the booking system, select a Schiedam date, and check the facilitator list shown before checkout. That view indicates whether Reineke or other guides are planned for that ceremony.
Plans can change due to availability, so treat the list as the most current indication rather than a guarantee.
I cannot verify live schedules here. For context on guides during Schiedam ceremonies, see this related Q&A.
Hope this helps, and good luck with your booking.