After the event

After the event, you can choose to verify the owner of the key as well. A simple way to do this is to send them a PGP signed e-mail using the key that they gave you at OSD. Many popular program's have PGP plugins (examples are MUTT, PINE, and Enigma). At least on Debian (and debian derived distributions) you can also use Caff can be found in the package signing-party.

See Post Event Instructions for details.