Hi Kessey11
You might find this webpage useful:
www.misas.org
At the top of this page there is a search box (at the
very top, not the "google" one below), where you enter the name of any town/village in Spain, and you will get a list of churches. After clicking on the name of each church, there will be the schedule of masses and a little map with the location of the church.
The site is in Spanish but it is quite easy to navigate, just make sure you spell the village name correctly. "laborables" means workdays, "festivos" means holidays and Sundays, "todos" means all, "verano" means summer, "invierno" means winter.
I came across a few posts on other forums where some pilgrims claimed they managed to attend the mass on the Norte every day. I think it requires a good deal of planning where to stay for the night plus a blessing from Saint James.... Also, quite often, in smaller towns, the Sunday mass is around noon time, and there may be no mass in the evening. In Basque region, the mass may be in the Basque language.
Buen Camino!