Fly to Geneva, Switzerland (fly to Bern or Luzern is also OK.)
I hope you can take care your own flight, car rental, train/cable car tickets, hotel/campground reservation, meals, and hiking gears. We just meet at the trailhead each day and do the hike together.
The detailed itinerary and meeting time and place will be provided around Aug. 1, 2019
Feel free to take train instead of renting a car. But then you need to reserve extra time for travel.