Will MacAskill is one of the originators of the Effective Altruism movement. His first book - Doing Good Better - is a well-written introduction to the core ideas of EA.

If you've read some (or all) of the book, come along and we'll discuss/debate some of the ideas. If you haven't read it but would like to, let me know and I can arrange a copy for you.

If you know someone else interested in EA, feel free to invite them along. If you can read chapter five beforehand, you'll be good to go.