I participated in this several years ago and it was a blast! You were clothes that you will throw away afterwards.you will be removing pieces of tomatoes from strange parts of your body for days.but, oh, so worth it.
*SPAIN ~ People from around the world descended on the streets of Buñol, Spain for its annual La Tomatina festival, where participants throw “more than 100 metric tons of over-ripe tomatoes in the streets.
From looking at the man in the center, he is wearing a watermelon on his head. This may show that in this event, people are throwing tomatoes, watermelons, or similar vegetables/fruits that share the same color.