Zagreb is home to a host a numerous unique events which one might not expect to find in the area.  Many of these cater to specialty interests but can be enjoyed by people who are new to these specialties as well.  For example, as anime becomes an increasingly popular art form across the world, fans eyes are turning to Zagreb which hosts the World Festival of Animated Films known as Animafest also the Music Bienniale which celebrates the art form, you can look at the traditional festivals, the most well-known is the celebration which takes place on November 16th of each year.  This is the Day of the City of Zagreb which is recognized by locals and travelers alike through a number of related activities. You will loved it!