Domagoj Jakopović Ribafish put together for 24sata.hr a very comprehensive list of all of the beer festivals in Croatia to be held in 2019.
May 4, 5
4. Osijek CRAFT BEER Festival
Sunčana ulica, Osijek
Over 50 types of beer, brewery owners and master brewers, independent brewers and entertainment by local musicians.
May 10-12
Craft Beer & Burger Weekend
Opatija
On the terrace of the Continental Hotel, the best Croatian craft beers will be sold at the promotional prices: Daruvarska pivovara - 5th Element, Bura Brew, Zmajska pivovara, Primarius Craft Brewery, Međimurski Lepi Dečki, Nova runda.
May 16-19
Zagreb Beer Fest 2019
Trg Francuske Republike, Zagreb
The biggest Croatian open-air beer and music festival.
May 18
Hombre - homebrew festival Osijek
Osijek
At the fair location called Pampas, a homebrew festival will take place, and you can participate if you bring a keg per person.
May 17, 18
Dani piva 2019. Daruvarske pivovare
Daruvar Main Square will host the second day of the festival organized by their local brewery, Daruvarska pivovara.
May 23-2
R'n'B Weekend
Glyptotheque, Medvedgradska 2, Zagreb
Combining best of music, food and drinks, organized by an expert Tomo Ricov, should be an interesting novelty.
May 31 - June 2
Beerfest Sjever IX
Ivana Novaka 38, Čakovec
Beerfest North to be held at Stari Hrast, industrial site converted to the heart of Čakovec, hosted by Lepi Dečki Brewery.
May 31 - June 2
PICNIC 2, Festival craft piva i roštilja
Muzejski trg 1, Rijeka
70 top craft beers in Croatia, exquisite burgers and a wide selection of whiskey and gin.
May 31 - June 1
Beeram domaće
Trg Vinkovačkih jeseni, Vinkovci
12 craft breweries are participating, Prljavo kazalište and Psihomodopop are performing, festival glass sold for 10 kn only!
June 7
Fakin Craft Fest: 25 pivovara za 25 godina Medvedgrada
Fakin, Zagreb
To celebrate their 25th birthday, Fakin will hold an open-air festival, with 25 breweries participating.
June 14-17
Križevačko veliko spravišče
Beer day of the biggest party in Križevci will take place on Friday!
June 14, 15
Dubrovnik Craft Beer Festival
Solitudo Camping
Over a hundred different types and styles of beer at one of the most amazing locations!
June 15
Craft Beer Festival Županja 3
MKC Županja, B. J. Jelačića 2b
June 29
XI Požeška krigla 2019
Stari Fenjeri, Turnić kraj Požege
Over 40 brewers offering their beers, at a location that's inviting you to camp, barbeque and party outside for the entire weekend.
June 29
Zmajevo 2019. - festival craft piva i muzike
Zmajska pivovara, Zagreb, Jankomir
Zmajska Pivovara on Jankomir will host another open-air festival of craft beers and music, with numerous bands and over 25 beers - including some international ones.
July 19-21
S.A.R.S. Music & Beer festival Sinj
Amateur rock festival first started in 2003 and has become an important beer location as well.
August 15-17
Novogradiško glazbeno ljeto
This is the main event of the summer in Nova Gradiška, and it includes a beer evening with the best local craft beers.
August 16
Craft Beer Festival Punat
September 5, 6
Medulin Craft Beer
September 5-7
Zadar Craft Beer Festival
Obala kralja Petra Krešimira IV., Zadar
Over a hundred types of beer, an amazing line-up of performers, free entry, well-known central location in Zadar!
September 28
OktoberTest
Križevci
Tasting of the homebrewed beers by the people of Križevci and region.
September 28 - October 6
Istra & Craft Beer Festival
Poreč
Festival for the small, independent craft breweries, celebrating the culture of the streets, ambitiously taking a full week!