The Spanish are not inclined to over-arching organizations. While the RCC in Spain has a bishops' conference, each diocese runs its own show. The Camino Francese is remarkable in that the Spanish bishops actually collaborated!! they decided to staff churches (as far as possible) with polyglot clergy, and as far as possible to have parishes along the way provide regular evening masses. Other Caminos do not have this focus put on them and as the OP notes, it can be a challenge to find open churches, etc.
Add to this the Spanish proclivity to assume that those who go to mass in a pueblo know what time it will be held, so there is no need for noticeboards. I have found that the barkeep at cafés near a church will know, and so will many older people in a pueblo-- if they don't, there is no surprise as a good chunk of the Spanish population view religious practice as a marker of civil war partisanship. If you pass by a church when a funeral is held, there will be a small group of people (usually men) standing outside the main door, to show respect to the deceased, but they will not enter. Ask around and villagers will be happy to assist pilgrims-- I've had the experience of tattooed teenagers on their mobiles to their grannies to find the mass time for me. If you enjoy sitting in front of a screen before you travel, diocesan websites sometimes provide the information.....
I note from your profile that you are from Arizona; APOC has an excellent grants programme to aid albergues along the way and IIRC donations are tax-deductible for US taxpayers (
https://americanpilgrims.org/grants/). Others have suggested support for donativos-- they always have expenses which the donations do not cover. One repeat pilgrim I met told me that he marked particular good things which had happened to him or to his family with a significant donation to an albergue-- while he could afford significant, even small amounts have a cheering effect on albergues. And if you don't want the paperwork, APOC or the Confraternity (Rabanal & Miraz-- also supported by the CCoP) will bundle your donation with others.