I don’t know when I will be able to join as I will have an examn this day, and in the eveining I will meet some (other, since you are too) friends 
When I’ll come, I’ll bring my big bluetooth speaker to provide some music 
If people are interested, I can bring chess and/or scrabble (German), and regular playing cards as well as bidding boxes if there are Bridge players among you. While I’d love to bring Carcassonne, I doubt it will be practical to play it in the grass… 