We will sing the European anthem in our different languages, we will make a dictionary with common phrases (greetings, What's your name? Where do you come from?, numbers from 1 to 10), we will compare the other siede of our coins if we have Euro (if not, what's on your coins?), we will write the names of our countries in all of our languages (the same with the capital city if it is different). We will compare the national days (dates and what is celebrated), make a book about famous buildings, food and famous people.
There would be one representative from as many countries as possible (ony one from each coutnry).