MiniDebConf Barcelona can be a nice opportunity to get our PGP keys signed by new people.
The process can be done 1 by 1 at any time. Just remember to bring (lots of) hard copy pieces of paper with your keys info and fingerprint, and an official (or more than one if you want to have it signed by a DD) document to prove your identity (passport, Spanish DNI, whatever).
You can wear a sticker to announce that you want to sign PGP keys.
If you're new to PGP or want to begin to use this public-key cryptograpy system, you can learn more at: