Pass'Portes is a Mountain Biking Trek across the Portes du Soleil (the area Les Gets is in). For one long weekend each year the whole mountain biking community comes together for one big trek.
The course is open for the 3 days of the long weekend - Friday, Saturday and Sunday, and you can pick which day you'd like to do the trek.
The course itself is an 80kms loop through France and Switzerland, ranging from 1000m to 2250m in altitude. It takes in 15 lifts on route, though there are variations on the route you can pick depending on whether you'd like to cycle uphill or take the lifts.
For the whole weekend the Pass'Portes Mountain Bike Show is held in Morzine (10 mins from Les Gets), and there's a great atmosphere for the whole weekend as mountain bikers from across the world flock to the Portes du Soleil for this event.
It's very popular so make sure to register early to claim your spot. It costs €52 for adults and €23 for children.
You can do the Pass'Portes trek (it's a one day ride) on either Friday or Saturday, though remember to reserve your spot early.