Hotel
Hotel Westin is the closest hotel to the venue (5 min.walking), however, there are also a lot of AirBnb options in the city center, as well as some youth hostel for the younger crowd (or those who feel like that). Stick to the city center and you won't have to rent a car, there is public transportation, taxis, uber. Book your accommodation ahead of time since August is a popular season in Croatia. Sorry :/
Flight
You should be flying to Zagreb airport. {If you find cheaper options and are up for an adventure - other airports to consider are Split, Rijeka, Zadar (Croatia), Ljubljana (Slovenia), Vienna (Austria), Budapest (Hungry),} but Zagreb tends to be the cheapest, especially since then you don't have to worry how to get to the city. Taxis, Uber or buses from the airport to the city center are available (20 min. drive).
Rental Car
Several options are available at the airport, it depends on your preferences. Cars are driven on the same side as USA, Canada and mainland Europe. Request an automatic shift if you are not used to manual. Unless you are planning on taking trips outside of the city, it is not necessary to rent a car while in Zagreb.
Travel Note
Here is a link ______ to a cool Zagreb guide map we found on AirBnb that maps a lot of restaurants, coffee shops, markets, squares etc. We are also preparing a pdf Survivor guide for some of our favorite places in Zagreb. We recommend you also take a few days to visit Croatian coast and indulge it's beauty...from the food and wine(or beer) to pretty beaches, mountains and islands...we don't think you will regret! If you need further recommendations reach out to us, but some of our top recommendations are: National Parks: Plitvice (A MUST - lakes, waterfalls), Krka (river, waterfalls), Brijuni, Kornati, Mljet (islands) Coast: Dubrovnik, Split, Zadar, Sibenik, Trogir (history, food, beaches outside of the cities) Istria peninsula (wine tasting, gourmet tourism, history) Peljesac peninsula (wine tasting, gourmet tourism, beaches) Primosten, Brela (small coastal cities) Brac (famost beach Bol), Mali Losinj (beach), Vis (blue cave), Hvar (fancy), Pag (party) - all islands