You can find a detailed pdf file here of how to arrive to the venue and some related information.
Some additional information:
The bus tickets can be bought inside the bus/tram paying by card (no additional cost, 50% off for students up to 35 yo) or from one of the apps listed here. If you arrive from Modlin Airport you can buy the tickets for the bus+train here. You could also take a FlixBus for which you can buy the tickets on the bus paying cash (only PLN).
Where to eat:
In this pdf file you can find a comprehensive list of where to eat close to the venue.