Is a car provided or do we have to rent one? Will we have someone who can drive, or do we have to bring an assistant who has a drivers license?

We will have few "taxi"s thanks to our volunteers. But we can't predict how many of them will be available.
We know, from our previous experiences, that its best to come by car (or rent a car in Poland if you come by for example plain), but it is not necessary to enjoy the event, only there will be less option for shootings, or counting on the partner (photographer or cosplayer) with who you will have a photoshoot.