www.ljepotu.hr – Fantastic Zagreb Film Festival 

www.inmusicfestival.com – a well established music festival, mostly happens in June each year

www.zagrebcard.com – 98 or 135 kuna (14-18 Euro) for either 24 or 72 hours of free entrances or  discounts to 55 locations like museums, galleries and restaurants 

www.zagreb.com – the cities official website