12th International Semantic Web Conference (ISWC), Sydney 2013
From the webpage:
ISWC 2013 is the premier international forum, for the Semantic Web / Linked Data Community. Here, scientists, industry specialists, and practitioners meet to discuss the future of practical, scalable, user-friendly, and game changing solutions.
Detailed information can be found at the ISWC 2013 website.
I count thirty-six (36) videos (including two tutorials).
Some of them are fairly short so suitable for watching while standing in checkout lines. 😉