In Barcelona, Palm Sunday is celebrated much like it is here, with a few differences. Faithful Catholics go to Mass to celebrate Jesus's arrival in Jerusalem, and have their palms blessed. However, where generally our priests will process around the inside of our church and sprinkle holy water on the crowd, congregations in Barcelona actually leave the churches (lead by their pastors) and process around their neighborhoods, waving their palms (and olive branches!) and stopping periodically to sing and pray. Sometimes parishes will even bring a donkey to walk with them (since Jesus road into Jerusalem on a donkey).
Palm Sunday also carries a special sentiment for godparents and godchildren. God parents will play a special part in the Mass by gifting special palms to their godchildren. Boys receive "palmónes," or exceptionally tall palms, while girls receive "palmas," or intricately woven palms. Palmas can be bought at stalls outside of churches, or woven by the godparent.