I found this somewhere  and i am dissapointed that our balkans reporter didn't post anything about it.

10th MTB Hillclimb to Mt Zavižan in Croatia from 0 to 1594 m, Saturday June 23rd.

Registration can be done here http://www.tz-senj.hr/.

past race

This year 2013 the most popular Croatian amateur MTB race shall start on Saturday June 22nd from the port in Senj and from the village Oltari at 940 m above the sea level. Finish line is at 1594 m for all riders.
Information at the organizer's website www.tz-senj.hr and info@tz-senj.hr .
Cumulative results of the last four races are shown here: http://malojcic.wix.com/mtbzavizanresults .
Few reports exist on Youtube under keywords " Uspon na Zavizan "

Closest airports Rijeka, Zadar, Pula, Zagreb, Split and Ljubljana.
Welcome!