Island Ciovo is very close to Split Airport with a further 30mins drive to the location. There is a small bridge that connects the island to the mainland in Trogir as well as the new Ciovo bridge which can be less congested in the Summer. Free parking is available on site. Camping by the beach with all amenities is included in the ticket price where you can chill out in the shade and swim in the daytime.
You can also choose to fly to Zadar which is an 1.5 hour drive to the location or you can get a bus from Zadar city centre to Ciovo, after taking the cheap shuttle from the airport to the bus station.
There are also regular boats from Split City to Slatine which is just 30mins across the water and not too far from the festival site.