Arriving late night in Zagreb, 03/08 Questions? ✌️🤓

Hello all! 🤗

I'm arriving 00:00, at Zagreb Airport on the 03/08 ( Thursday ).

Im heading towards Modem Festival, in the morning. And stay at hotel / hostel seems pretty waste just for a few hours during the night.

Is there any good places to hang around until morning? Would it be okay to relax, get some sleep in a park or similar?

Maybe someone knows some 24/7 places , bars, hostels with nice vibes , backpacking style ✌️?

Kind regards!