For any questions and requests you can send us an e-mail at firstname.lastname@example.org (highly preferred).
But you can also:
give us a ring at +385 1 4571203 (think of the time zones)
contact us via live chat on this web page (click on purple circle in right bottom corner)
send us an old-fashioned letter to: Hrvatska udruga kristalografa (for EPDIC17), Bijenička 54, HR-10000 Zagreb, Croatia (we shall be absolutely charmed but take the time into account before deciding to do so)
Have a question, got an idea? Send us an e-mail.