As a PhD student you are assigned to one of the Graduate Schools.
Graduate Schools offer a wide range of training courses in your field, organize lectures and seminars.
It is also good to know that you can apply to a Graduate School to subsidise your project, pay for the conference's fees, and partially finance printing your book.

More information you find on the Rug website:
http://www.rug.nl/corporate/onderzoek/graduateschools/overview

Graduate School of Science

Graduate School of Medical Sciences (BCN, GUIDE, Kolff Institute, SHARE)

Graduate School of Humanities

Graduate School of Philosopy

Graduate School of Economics and Business

Graduate School of Behavioural Sciences and Social Sciences

Graduate School of Spatial Sciences

Graduate School of Law

Graduate School of Theology and Religious Studies