My boyfriend and I went here during our time in luang prabang. We read about it in lonely planet, and being teachers thought it seemed like a great way to help out.
There are 2 times in the day that they run English sessions, 9-11am and 5-7pm. We turned up at 9am but no one was around wanting to learn, unfortunately, so left. We then came back at 5pm. For a while there was more english speakers than Laotians, but after 530 more started to turn up - students in high school, some in college, some learning English outside of school and a few novice monks. The levels of spoken and understood English vary wildly, but most are very keen to learn, to share with you and to learn about you and your life. They appreciate your efforts. It made me realize how crazy the English language is - some words and pronunciations are very hard to explain, especially to one girl who was working her way through a giant Lao-English dictionary!
They also sell books (starting at $1.25) written in Lao or Lao and English. You can donate these for them to give to village children, or you can take them to give as presents on your travels. Many people in Lao have never owned a book so they really appreciate it!
You can also sponsor a book party, where you go with them to deliver books to a whole village. Looks amazing! This charity does great work. Check them out online.