If you have opened the evaluation area and found a competition you do not remember being invited to, with a deadline years away, it is the demo.
What it is

The demo is a practice competition. It exists so that a new juror can see what the scoring screen looks like, and try it, without touching a live entry.
It appears for anyone who opens the evaluation area, which is why it can show up unannounced. You were not added to a real jury by mistake.
How to tell it apart from real work
- The name refers to demo or onboarding rather than a real competition.
- Its jury deadline is years in the future, where a real one is weeks away.
- The entries in it are not anybody's real submissions.
If you are unsure whether a competition in your list is real, check whether it appears on your profile as a jury role, or ask contact@uni.xyz before scoring.
Do the scores count
No. Nothing you score in the demo affects any entrant, any result, any leaderboard or any published outcome. Demo scores are periodically cleared out.
Score freely in it. That is what it is for.
Real judging
If you expected real entries and only the demo appeared, your jury assignment is probably incomplete. Being listed on a competition's panel and being assigned to an evaluation round are two separate steps, and only the second gives you entries to score. See Your juror dashboard is empty.