Signing up:
1. Register for the event here.
2. Install the toplogger app on your phone and make a booking (one week in advance) at Gropo for August 30th at 18:20. If no slots are available you can also book at 18:00 or 18:40. Bookings open only one week in advance, you will receive a reminder email by then.
Note that rent of climbing shoes is included in the price.