When you are in the Barcelona parade:
Do not push never to access an area because you can cause a fall or an avalanche: if the area is saturated or very full, look for another point to place yourself.
If you are accompanied or in a group, agree on a benchmark out of the area where the public accumulates to meet again in case they get separated or lost.
If you go with children take him by the hand. Explain to them what the risks are, what they can’t do and what they should do if they get lost.