Über uns
The purpose of the group is to organize occasional walks or bike rides, most likely in the Geneva area and sometimes associated with getting together to eat and/or drink. One or more of the members will propose a walk, for example to climb a hill or walk round a lake or explore a forest. The organizer will specify a date, time and location for the start of the walk. There's no obligation to attend.
This is a private group, for friends from the group "Geneva Hash House Harriers".
So, you should be a member of that group, and you should attend enough meetings to become friends.