There are a few events in Ljubljana that bring together young and old and if you happen to be in Ljubljana tomorrow, consider yourself lucky.
This years is the 61st edition of march along where used to be a barbed wire fence which surrounded Ljubljana during World War II. It is approximately 35 km long path leading around Ljubljana and there are 8 points (a bar, shop or a restaurant) which can serve as starting or ending point. Of course you can only join for a little part of the circle if you don't feel like marching all the way.
On the eight points you can get a paper for collecting stamps on every point. You don't need to finish the circle in one year, though. And even if you are not here tomorrow you can pick up your paper for collecting stamps any day in the tourist information center and start walking. The stamps are in restaurants through the year.
PST, as is most often called by the locals, meaning The Path of Remembrance and Comradeship (Pot spominov in tovarištva) is popular for recreational run, bike ride, walk and even cross-country skiing in the winter. Today they are promoting it under more contemporary name: The Green Ring, but note that signs on the path refer to it as POT (which means a path).
After writing a blog in Slovenian language for 10 years I have finally come to my sense and started writing one in English as well.