I am going to talk about the most important things for this festival, "La Tomatina". It is the rules! If you join this festival, you must obey them.
There are mainly 5 rules. The 1st is "Do not bring bottles or hard objects". Because in order not to cause accidents. The 2nd is "Do not tear T-shirts or throw them around". The 3rd is "Please crush tomatoes before you throw them". Tomatoes are harder than we expect. The 4th is "Be c
areful of the trucks which carry tomatoes". the 5th is "Stop throwing tomatoes when you hear the call of stop". It is very important to make a clear distinction between the beginning and ending. And more, I recommend you to wear goggles. Goggles are the essential item for this festival. 
Do you want to join "La Tomatina"? As you know, this is the festival of throwing tomatoes, so you will think "It is s a waste of tomatoes!". But this is very cheerful festival, so it will help reduce your stress.Thank you for reading. :-)
