Bull running

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I am from Malaysia and i am interested to know about this bull running event in Spain. What is this tradition all about? There's a few cases that i saw where participants get gored but still this tradition is alive and kicking. When did it started and what does it mean to the Spanish people? I've never been to Spain before so i'm curious about it.What other festival or events in this world that you guys can talk about? Maybe one day i would love to visit.