We can wield unimaginable power for the souls in purgatory during the week of All Souls Day, from Nov. 1-8. If we visit a cemetery and pray for a soul in purgatory, they a can be released by us; one on every one of those days. That is no small thing.
Imagine a soul’s euphoria to be suddenly bailed out of prison and taken to heaven. I know imagination is inadequate to comprehend such a moment, but still, it is a joy to partake in God’s mercy.
All Souls Day commemorates all who have died and are now are in Purgatory, being purified to atone for sins before reaching Heaven—where nothing unclean can enter (Revelation 21:27)…

http://www.ncregister.com/blog/armstrong/how-to-help-free-the-souls-in-purgatory