Rosalia is like a big party that happens in Spain to remember and honor people who have died. It happens every year in May and June, and people like to put flowers and other pretty things on the graves of their loved ones who have passed away.
During Rosalia, there are parades and festivals in many cities and towns all over Spain. People wear traditional dress and dance and sing to music. They even decorate the streets with colorful flowers and lights!
One of the important things about Rosalia is that it's not just a sad time to remember the people who have died. It's also a time to celebrate their lives and all of the good memories they left behind.
So, Rosalia is like a big party where people remember and honor their loved ones who have passed away, but also celebrate their lives and have fun with music, dancing, and parades.