Croatia’s inaugural Unknown Festival has made some late additions to its program.

A new festival from the creators of Field Day, Hideout and The Warehouse Project, Unknown takes place from September 10 to 14 in Rovinj, Croatia with the site nestled between the Adriatic sea and the old town. The boat parties – which are nearly always the highlights of these kind of festivals – are all sold out now (so if you missed out on tickets for FACT’s, which features sets by Jackmaster, Oneman and Last Magpie, don’t say we didn’t warn you), but there will now be a Boiler Room island at the festival, made available to a limited number of ticket holders on Thursday 12 and Friday 13 as well as, naturally, streaming via the web.

Playing on Boiler Room island: DJ History’s Bill Brewster, the Glasgow alliance of Optimo b2b Jackmaster, Fabric’s Craig Richards, Django Django and PBR Streetgang.

There are still tickets left for Unknown but the festival has issued a warning that stock is low – snap yours up here.