I'm not sure how euro-trashy it is - but I'd go for construction paper on the windows to black out the outside light - then use fairy lights/twinkle lights/christmas lights around the room....
Responsible KillJoy Mode
I'm sure you will all be responsible, BUT... you also might want ot consider having a person in charge of keys.. if you have that many people - and drinking you don't want them getting into a car and driving if they shouldn't be....
As you were
Jello Shots! Easy, relatively cheap - and while it's more white trash than euro trash - they are fun...
