General Discussion
I am currently writing a blog post on this very subject but here are a few other ways to pray for all souls.
When you see the parish obituaries, say a rosary for that soul.
Write down the death dates of various relatives, maybe even ancestors you haven't met and pray for their souls.
Pray for the souls who built the church you pray in. Whose names are inscribed on glass windows, pews or other constructions. Remember that they donated their wealth for our lord, giving of what they had to the church.
Pray for all unmarked graves in a cemetery.
Pray for the souls most forgotten
There are so many ways to pray for the poor souls in purgatory!