Sounds like that to do what yo want to do to the extent you wish you would have to rent one.
Its best possibly to start by `running a Slovak Night one day a week in a bar.
I used to DJ in bars and put on my own night. Its quite easy to get the run of a place for a night if you can bring a crowd.
Start on a week night, show them you can bring a crowd and then expand or host on other nights in other venues. Work your way up....
I dont see anyone taking the chance of handing their bar over to you to manage with no experience, its the owner taking the risk and you are not renting it so the owner has no return for his venture if it does not work out.
There are plenty of pubs that you could try the night in Im sure....good luck!