Partners from different branches/groups of European languages (Romance, Germanic, Slavic, Baltic, Uralic etc.) and divide a list of English words amongst them. Each partner will translate the list of words into their languages and they will try to add the pronunciation (in English transcription). Then the partners will make a poster of the word with all the translations and share it with others.
The partners can compare the similarities and point out the differences. Everybody will have something to present and celebrate the Day of Languages with.