Requesting https://pretalx.c3voc.de/divoc-bb3/schedule/export/schedule.json
Traceback (most recent call last):
  File "/home/voc/schedule/schedule_divoc.py", line 226, in <module>
    main()
  File "/home/voc/schedule/schedule_divoc.py", line 88, in main
    full_schedule = Schedule.from_url(main_schedule_url)
  File "/home/voc/schedule/voc/schedule.py", line 225, in from_url
    schedule = Schedule(json=data)
  File "/home/voc/schedule/voc/schedule.py", line 206, in __init__
    self._generate_stats()
  File "/home/voc/schedule/voc/schedule.py", line 465, in _generate_stats
    self.foreach_event(calc_stats)
  File "/home/voc/schedule/voc/schedule.py", line 425, in foreach_event
    result = func(event, options)
TypeError: calc_stats() takes 1 positional argument but 2 were given