They are very interesting, and impressive because you took care to "shoot" so much detail.
It looks as if the "Divine Mercy" and Sister Faustina have a large following in Poland. Somewhere in my collection of Polish photos, I have one of the outside of the house where her first apparition appeared.
1. There is a mass in the church 2. after the mass the procession takes place.
3. Procession route. Manieczki, my hometow is divided into 3 major ares, called "Old Settlement", "New Settlement", and a newest settlement "Słowiańskie" near the lake which is commonly referred as "Jay Hill" (Jay - bird, "Sójka" in polish). Every year procession goes to one of the settlements (they changes each year). People living there build 4 outdoor altars (just like the ones on photos) and there are short prayers at each of the altars. After all the prayers procession goes back to the church, and there is one more prayer - on road crossing near the church priest in waving a host in "monstrancja" (I don't know the word in english - this is what he is keeping in the hands, the golden thing) to the four sides of the world. Then procession continues to the church and after last short prayer celebrations are over.
4. Procession order
altarboys with cross and lamps mounted on long sticks
banner teams - usually 3 or 4 banners
girls which are spillng (strewing?) flowers on the road
priest with holy host + 4 men holding the canopy + 2 men holding priest arms (procession is long and he alone won't be able to keep the host up all the time)
rest of the believers
There are also guys carrying loudspeakers, parish organist singing songs and two altarboys with incense which is used at every altar.
All the celebrations usually take about 1.40 to 2 hours.
The chapels and shrines are scattered along roads, there are plenty of them, they look just like the ones on Piwo's photos - are not used during CC celebrations. In the villages, especially in May, people are gathering at the shrines to pray every evening. These altars I showed are built only for CC celebrations and the same day in the evening they are dismantled and stored so they could be used in next 3 years.
Also, i forgot to mention it earlier - houses along procession's route have holy pictures (saints, Pope, etc) and other related stuff displayed at windows.