As has been a tradition, the 62nd Walk along the Wire (Pot ob žici) will open with kindergarten children taking small sections of the trail, followed by school children braving longer ones on Friday.
The event will culminate on Saturday with a hike along the entire 35-kilometre circular Trail of Remembrance and Comradeship (Pot spominov in tovarištva) and in a threesome run in various categories for adults, children and youths.
The purpose of this unique run of three-member teams is to promote cooperation and comradeship, with all three members of the team making it to the finish line together.
Like last year thousands of participants will close their hands at noon to form a live circle, followed by a concert featuring a Partisan choir and rappers Nipke and Trkaj in Congress Square.
One of the biggest mass events in the country, the Walk along the Wire attracted more than 40,000 participants in three days last year.
The barbed wire around Ljubljana was put up in 1942 by the Italian occupying forces in order to stop supplies to the Partisan resistance.
Ljubljana was the only European city at the time to be locked out in such a way, a regime lasting for 1,170 days until the end of WWII in 1945.
Put up within three days in the length of almost 30 kilometres, the wire was lined with bunkers and minefields and patrolled by 2,500 troops.
You can learn more about the walks, and how to take part, at the official website (in English here).