Please don't add new answers. I don't understand how overlapping answers are supposed to be handled.

If the hike does not take place or is postponed it will resolve to N/A.

Attendee is anyone who joins for at least 30 minutes with the express purpose of participating in this "Rationality Freiburg" event.

The intervals are closed (include the endpoints) e.g. 6-8 is correct if and only if 6 people, 7 people or 8 people attend.

https://www.rationality-freiburg.de/events/2022-10-15-hike-with-karlsruhe-rationality/