How to track the owner of a lost iPad

Found an iPad while I was walking in Barcelona city.

the iPad was completely dead so I took it home, charged it and it’s obviously locked. Flight mode is on and the date of the iPad is set to 18.dec2023

I would like to find the owner, but I can’t turn off the flight mode cause I need to type in the password that I don’t have.

how can I contact the owner?

[Re-Titled by Moderator]