We just created a league for Prismic in monpetitprono.com which is a simple app to do predictions of the Euro of soccer starting next week. You pick the results of the games and you get points when results are good in real life.
At the end, there is a ranking and you know who was the best predictor. The winner gets their country's jersey.
If you want to join the league it here: https://monpetitprono.app.link/E0TPCuDSOgb
The idea is to do fun predictions and avoid the old excel sheet
The web app is available in English as well