Hi Janis,
great to hear you are using the challenge as a class project, that's awesome!
I will see if we can keep the evaluation system open until 1st of July. Upload of the final prediction file for the competition will end on June 14th but I'm sure we could keep the leaderboard upload and evaluation open longer. Will confirm with our engineers on Monday but I don't see any blockers to doing this.
Best regards,
Nick