One thing about traditions is that they are established over time. In Barcelona we have some very old ones (like the dancing egg or the Fira de Santa Llúcia) but fortunately we are also creating new ones.
For me, a recent tradition that has a special place on my agenda is the cinema outdoors in the summer. I do not know how long it takes to turn a habit into a tradition, but I do know that for me it is enough with the 10 years that the Cinema at Montjuïc has celebrated.
And do not tell me it's not an important tradition to be preserved. Going up the mountain with friends up to the castle of Montjuïc, installing oneself on the lawn, having picnic while hearing live music and then watching a movie is priceless!
And feeling the need to wear a jacket in the summer heat of Barcelona is also priceless!