Easter in Spain is wonderful. This will be the sixth time we're walking in Semana Santa and I'm really looking forward to starting.
From the tiny village we walked into where the old lady heading for the church grabbed us and pushed us to the front row of the congregation (all of 40 people) outside the church to watch the figure of Mary being carried around the church to bless the village to the huge musical procession in Burgos, with Nazarenos (looking like Ku Klux Klan members, but in bright colours) in all sizes coming together in front of the cathedral before hundreds of doves were released on Easter Morning - it's all been good.
Check with the tourist offices or ask the hospitaleros wherever you are about what kind of things will be happening in the next few days, and you will be able to time your days so you'll see whatever is going on.
I still remember the village where most of the ladies in town carried a statue of Mary, and the strapping young men carried a statue of Jesus, and the figures "just happened to meet" in front of the church, and the statues, carried by smiling people, DANCED with each other to celebrate the Resurrection. Or the morning disco in another small town, where the old people retired to church, and as soon as the doors were closed, the youngsters rigged up a mobile disco and had a dance in the village square. Or the lifelike statue of the sorrowful Roman soldier. Or the horrible screech of the untuned trumpet that the young girl was trying to play throught he hole in her mask before she gave up and put her hood back. Or...