1. the organization was very good.
2. the accommodation and food were very good.
3. the room was too small for the number of participants. With 2 participants less, there would have been more space for everyone.
4. the email inviting people to join the WhatsApp group to possibly form carpools or take someone with them from the last train station should be sent out earlier. 2 days before the start is too short, as trains and pick-up services (must) always be booked in good time. I would recommend sending this e-mail 2 weeks in advance and sending it to late registrants as soon as possible. Not everyone reads their e-mails every day and if messages have already been sent in the chat, those who join later can no longer read them.