The oldest cultural festival in Croatia, Dubrovnik Summer Festival takes place from 10th July to 25th of August in Dubrovnik presenting rich and vibrant theatre programme in the fields of theatre, ballet, classic music and opera. 
The Dubrovnik Summer Festival presents a rich programme of classical music, theatre, opera and dance on more than 70 open [...]

In yesterday’s eddition of The Observer, under the title ‘ How Croatia splashed on to the music festival map’, Luke Bainbridge, of Observer Music Monthly magazine, ‘ follows the clubbers to a sleepy fishing village on the Adriatic‘ .
Here is an excerpt from the article:

Queer Zagreb, festival which hosted so far some of the biggest figures of contemporary dance expression, controversial video projections, motivated discussions and artistic considerations is set to take place from 5th to 10th of May in Zagreb.

Days of Croatian Film Festival is opened today and will last until 23rd March 2009.
The venue is Student Centre Cinemas in Croatian capital - Zagreb.

The 5th ZagrebDox, an international documentary film festival, opened its door on Monday in Zagreb to all documentary fans and is still running until 01.03.09