The Pontifical University of St. Thomas Aquinas in Rome is hosting a conference titled "Recovering Causality: Historical Sources and Systematic Challenges from a Thomistic Perspective" June 24-26. This looks like an excellent conference. The 3-day event is open to the public and participants are asked to contribute a very modest 30 euro donation. You can find a PDF of the conference flyer with a complete schedule and list of speakers here. If you have questions or would like to pre-register, you can contact Bernhard Blankenhorn, OP at email@example.com (copy and paste please).